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Alfirmansyah Alfirmansyah; Insannul Kamil; Dwi Eri Yanti; Ummi Jayanti

JURNAL WILAYAH, KOTA DAN LINGKUNGAN BERKELANJUTAN 2026 Fakultas Teknik Universitas Cenderawasih

This study aims to formulate an engineering strategy for water quality management and pollution control in the Tiku Sub-watershed, North Musi Rawas Regency. The study used a descriptive approach by integrating selected technical data from a dissertation-based assessment with semi-structured interviews involving 20 key informants representing technical agencies, village and subdistrict governments, community leaders, artisanal and small-scale gold mining actors, farmers, and riverbank communities. The analysis focused on water quality status, water availability and demand, pollution sources, perceived impacts, implementation constraints, and priority interventions. The results showed that the Tiku Sub-watershed is under significant environmental pressure. The average pollution index was 6.65, indicating a moderately polluted status, while mercury, cadmium, phosphate, and ammonia were the dominant parameters of concern. Surface water availability remained relatively adequate at 45,842,699.79 m3/year, and the average Criticality Ratio was 0.266; however, the water pollution carrying capacity was poor. Interview results indicated that mercury use and processing waste from artisanal gold mining were the most urgent issue (35%), followed by land-cover change and riparian degradation. The recommended strategy combines mercury-free processing technology, alternative livelihood development, cross-sectoral supervision, riparian rehabilitation, and transparent water-quality monitoring. The findings imply that watershed engineering should integrate technical, institutional, and socio-economic interventions.

Ummi Jayanti; Vera Surtia Bachtiar

JURNAL WILAYAH, KOTA DAN LINGKUNGAN BERKELANJUTAN 2026 Fakultas Teknik Universitas Cenderawasih

Artisanal and small-scale gold mining (ASGM) provides short-term income for rural communities but frequently creates environmental, safety, and governance problems when it operates outside formal control. This study aimed to analyze the existing condition of ASGM, identify the driving and inhibiting factors of its arrangement, describe the perceived impacts, and formulate strategic directions for ASGM arrangement in Karang Jaya District, North Musi Rawas Regency, Indonesia. A qualitative descriptive approach was applied using semi-structured interviews supported by secondary data on the study area, population, and agricultural land use. Twenty-two informants represented district officials, village officials, technical agencies, company representatives, community leaders, nearby residents, and ASGM actors. Data were analyzed through reduction, presentation, interpretation, and conclusion drawing. The findings show that ASGM development is driven by gold potential, mining history, household economic pressure, limited alternative employment, and weak field control. The main impacts include land degradation, open mining pits, landslide and occupational accident risks, and mercury-related water and soil contamination. The recommended strategy combines alternative livelihood development, skills training, local economic institutional strengthening, gradual area monitoring, land rehabilitation, and mercury-risk education.

Ridwan Galema; Kalih Trumansyahjaya; Rahmayanti Rahmayanti

Globe: Publikasi Ilmu Teknik, Teknologi Kebumian, Ilmu Perkapalan 2026 Asosiasi Riset Ilmu Teknik Indonesia

Gorontalo Province possesses significant mineral resource potential, particularly gold, silver, and copper, positioning the mining sector as a key driver of regional economic growth. However, a shortage of skilled local labor and the scarcity of vocational educational institutions in the mining field severely hamper human resource development in this sector. This study aims to design a Mining Polytechnic Campus in Gorontalo by applying sustainable architecture principles, encompassing energy efficiency, environmentally friendly materials, sound wastewater management, and user comfort. The research approach involves literature studies, field observations, interviews with relevant stakeholders, and quantitative data analysis regarding resource potential, the number of senior high school students, and educational space requirements. The design results emphasize site arrangement, building mass configuration, utility systems, and interior and exterior spaces that support academic, social, and community activities. The application of sustainable architecture principles is expected to create a campus that not only meets the needs of mining vocational education but also contributes to environmental conservation and sustainable regional development.

Mira Maslakhatul Latifah; Suseno Suseno

Bhinneka: Jurnal Bintang Pendidikan dan Bahasa 2026 Universitas Palan

The exploitation of natural resources in coastal areas and small islands in Indonesia shows the strong influence of the ideology of extractive capitalism. This ideology often causes ecological conflicts. For example, in the case of the rejection of gold mining that occurred on Sangihe Island, North Sulawesi. This article examines the contemporary Indonesian novel Perempuan yang Tunggu di Lorong Menuju Laut by Dian Purnomo in representing this problem. This study is a qualitative study with an interdisciplinary approach. The main theoretical framework used is ecocriticism (Glotfelty & Buell), extractive capitalism (Gudynas, Harvey, and Bebbington), and the concept of slow violence (Nixon) with a close reading method of the text. The results of the study show that the novel represents: the ideology of anthropocentric-extractive capitalism that reduces Sangihe Island to an economic commodity; dismantles the mechanism of power that conquers law and politics through the practice of elite and ruler collusion; displays the ecocentric resistance of the Sangihe community based on ancestral wisdom and spirituality. In conclusion, this novel voices an ideological critique of the hegemony of anthropocentrism and extractive capitalism and calls for a just and sustainable ecological awareness. Given the novel's limited data, further studies could consider exploring other research subjects or developing a theory of this research subject.

Marcelia Amanda Slaliahi; Michael Lega; Suci Rahmadani

Desentralisasi : Jurnal Hukum, Kebijakan Publik, dan Pemerintahan 2026 Asosiasi Peneliti dan Pengajar Ilmu Hukum Indonesia

This study examines the environmental advocacy strategies carried out by WALHI Jambi in addressing the pollution of the Batanghari River caused by illegal gold mining activities. This issue reflects ongoing environmental degradation and weak policy enforcement in managing natural resources. The study aims to analyze advocacy practices in terms of raising public awareness, community organizing, and influencing policy. A qualitative approach with a case study method was employed, with data collected through in-depth interviews, observation, and document analysis. The findings show that WALHI Jambi has undertaken various advocacy efforts, including media campaigns, public actions, community assistance, and engagement in policy forums. However, these efforts remain not fully optimal. Public awareness initiatives are still limited to information dissemination, community organizing has not yet developed into a strong collective movement, and policy influence is constrained by the absence of systematic instruments such as formal documentation, litigation, and structured coalitions. This study contributes to the understanding of environmental advocacy practices and highlights the need for strengthening advocacy strategies to achieve more effective policy influence and sustainable environmental governance.

Lisa Virgiyanti; Amru Ash Shodaq; Fahrul Indrajaya; Neny Fidayanti; Neny Sukmawatie

Jurnal Riset Rumpun Ilmu Teknik 2026 Pusat riset dan Inovasi Nasional

Takaras River is a river basin that is vulnerable to pollution, particularly from the mercury usage in small-scale gold mining. This study aims to identify water quality based on mercury (Hg)and pH levels in the Takaras River. Samples were taken at two locations using a purposive sampling method. Results showed indications of mercury use on former gold mining land around the Takaras River altought the mercury content level was below 0.075 µg/L or 0.00075 mg/L in sample 1 and 2. Based on the test results, the acidity level (pH) in the two water samples from Takaras River is 3.86 and 3.84 in sample 1 and 2, compared to the maximum pH quality standard of 6-9 for Class II water, it is concluded that the scale of acidity in Takaras River is very low, indicating that the water quality in the Takaras River is highly acidic, abnormal, and shows signs of serious pollution. The implications of low pH levels in the Takaras River can cause damage to the Takaras River ecosystem, a decline in soil quality and fertility, and an increase in heavy metal toxicity in the environment surrounding the river.

Kiki Heriyanto; Abdul Halim

Desentralisasi : Jurnal Hukum, Kebijakan Publik, dan Pemerintahan 2026 Asosiasi Peneliti dan Pengajar Ilmu Hukum Indonesia

In Indonesia, illegal gold mining (PETI) is still a persistent environmental crime, especially in resource-rich areas like Bungo Regency, Jambi Province. The efficacy of local law enforcement is still in doubt, despite the fact that Article 158 of the modified Mining Law (Law No. 3 of 2020) offers a solid legal foundation for criminal penalties. The purpose of this study is to evaluate the efficacy of criminal law enforcement in Bungo Regency against PETI from the standpoint of Islamic law based on maqāṣid al-sharī‘ah. This study uses a juridical-empirical approach, combining pertinent court rulings, field data from law enforcement, and normative legal analysis. The results show that although legal measures like arrests and convictions have been carried out, they have not had a major deterrent effect. The overall effect of enforcement operations is weakened by structural issues, such as the economic dependence of local populations, the scarcity of alternative livelihoods, and the difficulties of prosecuting informal financiers. According to maqāṣid al-sharī‘ah, illicit mining is incompatible with the defense of basic principles, especially the preservation of life (ḥifḍ al-nafs), property (ḥifṢ al-māl), and environmental sustainability. The study comes to the conclusion that effective law enforcement necessitates an integrated strategy that combines preventive and rehabilitative tactics, such as economic empowerment, legal awareness campaigns, and regular supervision, with repressive measures. A more equitable, long-lasting, and socially conscious form of environmental criminal law enforcement is provided by combining positive law with the ethical framework of maqāṣid al-sharī‘ah.

Susi Turti; Adi Nur Rahman

International Journal of Law, Crime and Justice 2025 Asosiasi Penelitian dan Pengajar Ilmu Hukum Indonesia

This study examines the critical role of expert opinions from the Ministry of Energy and Mineral Resources (ESDM) during the investigation phase in uncovering gold mining without permit (PETI) crimes under Article 120 of the Indonesian Criminal Procedure Code (KUHAP) in West Kalimantan. The research employs a normative-empirical approach, analyzing legal provisions, government reports, and judicial practices to assess how ESDM experts contribute to establishing the material truth of PETI cases. Findings reveal that expert opinions are indispensable for verifying the absence of permits, assessing environmental damage, and quantifying state losses, thereby strengthening evidentiary frameworks for prosecutors and judges. However, challenges persist, including coordination gaps between law enforcement and ESDM, insufficient technical capacity among investigators, and potential threats to expert independence. The study concludes that optimizing the use of ESDM expertise is not merely procedural but strategic for effective, accountable, and just enforcement against PETI, which remains a significant threat to national resource sovereignty and environmental sustainability.

Rafael Ivo Jonatan; Rendra Arief Hidayat

International Journal of Economic, Social and Development Sciences 2025 International Forum of Researchers and Lecturers

This study analyzes the effect of Bitcoin prices, the LQ45 Index, mutual fund net asset value (NAV), and the net profit margin (NPM) of gold mining companies on the price of gold as a safe haven asset within the context of the Indonesian financial market. Gold is often seen as a safe haven asset that is the primary choice of investors when economic uncertainty increases, but the relationship between gold and various other investment instruments still requires further study. This study uses a multiple linear regression method with a robust standard errors approach to analyze 420 monthly and quarterly data observations during the 2018-2022 period. The results of the study found that the price of Bitcoin and the NPM of gold mining companies had a significant positive influence on the price of gold, while the LQ45 Index had a significant influence effect. Meanwhile, the NAV of mutual funds showed a significant positive influence that was not in line with the initial hypothesis. These findings indicate that gold does not always function absolutely as a safe haven asset, as its role is contextual and still influenced by the dynamics of other investment instruments such as digital assets, stock markets, and mutual funds. The study's results make an important contribution to financial literature by proving that the safe haven characteristics of gold are complex and dynamic, so investors need to consider various factors and market conditions before allocating investments to gold as a hedging strategy in their portfolios.

Endang Retno Suryowati; I Gusti Ayu Ketut Rachmi Handayani

Prosiding Seminar Nasional Ilmu Hukum 2025 Asosiasi Peneliti dan Pengajar Ilmu Hukum Indonesia

TJSL/CSR in Indonesia is regulated as a legal obligation (mandatory) for companies engaged in the natural resources sector. Its success depends on the principle of accountability, which requires transparency and responsibility. This normative-juridical study evaluates the application of accountability principles in the mining sector. Normatively, PP 47/2012 requires CSR to be listed as an expense and focused on sustainable development (PPM). However, this regulation is not robust because it does not set a minimum fund allocation or clear program boundaries, allowing for multiple interpretations. Empirically (Sekotong case study), accountability is implemented in a formalistic manner, consisting only of one-way administrative reports without meaningful participation from the affected communities. A significant weakness is apparent when dealing with the increase in illegal gold mining (PETI) in legal concession areas. This situation results in a vacuum of responsibility. Companies can claim environmental damage caused by PETI, so that responsibility does not successfully ensnare corporate negligence in prevention efforts. The CSR accountability structure in Indonesia is weak because it only emphasizes activities that are carried out, not negligence that is overlooked. Regulatory reform is needed so that accountability includes passive responsibility to ensure that TJSL functions as a significant instrument of sustainable development.

Muhamad Firmansyah; Henny Armaniah

Manajemen Kreatif Jurnal (MAKREJU) 2025 Pusat Riset dan Inovasi Nasional

This research is motivated by the decreasing production of gold mines every year, which will also affect the company's profitability. As for the methods used to measure the level of profitability of a company, one of them is by using return on assets. The level of profitability is also influenced by several other factors, including the current ratio and debt to equity ratio. The purpose of this research is to determine and analyze the influence of the Current Ratio and Debt To Equity Ratio on Return On Assets, both partially and simultaneously. This research uses descriptive quantitative methods. Researchers collected, classified and analyzed sample data using purposive sampling techniques. With 6 company samples consisting of 30 data selected and analyzed using the IBM SPSS version 27 program. The results of research and partial hypothesis testing. Current Ratio has no significant effect on Return On Assets with a value of tcount 1.228 < ttable 2.052. Debt To Equity Ratio has a significant effect on Return On Assets with a value of tcount 2.725 > ttable 2.052. The results of research and hypothesis testing with a value of Fcount 4.020 > Ftable 3.369 from the Current Ratio and Debt To Equity Ratio simultaneously have a significant effect on the Return On Assets of gold mining industry subsector companies listed on the Indonesia Stock Exchange for the 2018-2022 period.

Indri Artanti; Ardi Mustakim

Algoritma : Jurnal Matematika, Ilmu pengetahuan Alam, Kebumian dan Angkasa 2025 Asosiasi Riset Ilmu Matematika dan Sains Indonesia

Batang Bungo River faces severe pollution from domestic waste and illegal gold mining, which has led to an increase in skin diseases and diarrhea among residents of Tanjung Gedang, exacerbated by poor physical-chemical water quality, including low pH and high levels of Total Suspended Solids (TSS) and Chemical Oxygen Demand (COD), all of which foster the growth of pathogenic microorganisme. This study aimed to identify bacteria and fungi present in Batang Bungo River water, characterizing their colony morphology and microscopic structures to understand the impact of pollution on microbial communities. The methodology involved serial dilution of water samples, followed by inoculation onto Nutrient Agar (NA) media using the pour plate technique, and incubation at 37°C for 24-48 hours. Macroscopic observations of colonies (color, shape, texture) were performed, and representative colonies were stained with crystal violet for microscopic observation at 1000x magnification to identify cellular and hyphal structures. The results indicated the presence of various microorganisms, including Gram-positive bacteria, filamentous fungi, and possibly protozoa, with colonies exhibiting characteristics such as off-white color, rough surfaces, and irregular edges. Microscopic examination after crystal violet staining revealed rod-shaped (bacilli), spherical (cocci) structures, and branched filamentous structures resembling hyphae, consistent with a mixture of bacteria and filamentous fungi. The identification of pathogens like Clostridium, Dermatophilus, and Escherichia coli in previous studies, coupled with the poor water quality, confirms significant microbiological and chemical contamination. Crystal violet proved effective as a stain for microscopic identification of microorganism structures. In conclusion, the water quality of Batang Bungo River is highly concerning and requires serious attention for monitoring and management to safeguard public health and the river ecosystem.  

Muhammad Osaegi Restu Amrulloh; Rochmad Choirul Muachor; Zinedina Salsabila Mustain

Master Manajemen 2025 Fakultas Ekonomi & Bisnis, Universitas Nusa Nipa

The mining sector in Indonesia inherently involves high OSH (Occupational Safety and Health) and Environmental risks, necessitating strict adherence to regulations like Ministerial Decree of Energy and Mineral Resources No. 1827/2018 and Directorate General of Mineral and Coal Decree No. 185/2019. PT Putra Perkasa Abadi (PPA) at the Borneo Indobara Site launched the Indobara Pillar Program to optimize SHE (Safety, Health, Environment) performance and achieve "gold category" status. This research aims to analyze the effectiveness of the program's implementation from February to June 2024, and to identify its supporting and hindering factors. As a case study, this research will describe the implementation process, evaluate target achievement, and analyze influencing factors. Despite the program's launch, January 2024 data showed initial challenges: 67% overall program achievement, with only 38% of programs being effective. Key issues included inconsistent monitoring, unsuitable forms, poor synchronization of internal leading indicator data, insufficient understanding among SHE Group Leaders, and suboptimal personal safety awareness. These challenges directly impacted SHE performance targets. In conclusion, this in-depth analysis is expected to identify how the Indobara Pillar Program can be optimized, contribute to OSH/SHE literature, and enhance the company's safety culture comprehensively.

Mutiara Septiani Tasya; Nurul Huda

Jurnal Penelitian Manajemen dan Inovasi Riset 2025 Asosiasi Riset Ilmu Manajemen Kewirausahaan dan Bisnis Indonesia

This study aims to analyze market sentiment towards Gold Financing Products (PKE) in Islamic banking before and after the Trump Effect phenomenon using the text mining method. This technique involves extracting information from unstructured text data to then be visualized and analyzed using the Natural Language Processing (NLP) approach and a RoBERTa-based classification model. Data was collected through web scraping from the X application with the help of API and processed using Google Colab. From a total of 4,074 tweets analyzed, it was found that the majority of public sentiment was neutral (59%), followed by negative (24%) and positive (17%). This reflects the public's tendency to discuss informatively rather than emotionally, although there was a spike in negative sentiment in certain periods indicating sensitivity to global dynamics, especially the impact of the Trump Effect on gold prices. The resulting wordcloud reveals key topics such as gold prices, buying and selling activities, and institutions such as Pegadaian Syariah and BSI. Terms such as "sharia", "riba", and "principles" emphasize the importance of Islamic financial values ​​in public perception. The results of this study indicate that text mining-based sentiment analysis is effective in capturing the dynamics of public opinion in real-time and can be a strategic tool for Islamic financial institutions in responding to market changes.

Yesaya Kaho; Feliks Arfid Guampe; Olvit Olniwati Kayupa

International Journal of Economics and Management Sciences 2025 Asosiasi Riset Ekonomi dan Akuntansi Indonesia

This study explores the dual impact of artisanal gold mining on economic livelihood and environmental sustainability in Tedeboe Village, Rampi District, North Luwu Regency. Employing a qualitative case study design, data were gathered through in-depth interviews with four key informants—including the village head and three local miners—and through direct field observation. Data were analyzed using Creswell’s qualitative analysis framework, encompassing coding and thematic development to capture nuanced insights. The findings indicate that artisanal gold mining has significantly improved household income, especially in meeting basic needs and funding education. However, the sector’s informal nature and high dependency expose the community to economic volatility. Moreover, despite limited use of chemicals, awareness of mercury’s environmental and health risks is rising among miners. Environmental degradation, particularly soil and water pollution, alongside potential respiratory hazards, emerges as a critical concern. The study underscores the urgent need for sustainable mining practices, stronger local regulation, and capacity-building through education and economic diversification. These findings advocate for a balanced approach to rural development—one that harmonizes economic benefits with ecological resilience and community well-being.

Mawardi Heru Prasetyo; Dewi Wahyuni K. Baderan; Marini Susanti Hamidu

Hidroponik : Jurnal Ilmu Pertanian Dan Teknologi Dalam Ilmu Tanaman 2025 Asosiasi Riset Ilmu Tanaman Dan Hewani Indonesia

Exploitation of mineral resources through mining activities in Indonesia provides significant economic benefits, but also causes various negative impacts on the environment and socio-economic life of local communities. This study aims to review the impacts of various types of mining activities such as sand, coal, and gold. Common environmental damages include deforestation, soil erosion, water, soil, and air pollution, and decreased biodiversity. Socio-economically, mining increases social conflict, health problems, and changes in people's livelihoods. Effective management efforts include law enforcement against illegal activities, implementation of reclamation and rehabilitation, application of impact mitigation technology, and active involvement of local communities in environmental management. Consistent implementation of policies and mitigation measures is key to achieving a balance between economic benefits and environmental sustainability.

Aburagheb Amani; Mohammad Asif Gardezi

International Journal of Social Science and Humanity 2025 Asosiasi Penelitian dan Pengajar Ilmu Sosial Indonesia

Afghanistan, often called a "geological treasure trove," is richly endowed with vast mineral deposits worth over $3 trillion. The minerals, including copper, lithium, iron, gold, and rare earths, can be used to resurrect the nation's economy, reduce dependence on foreign aid, and bring about political stability. However, three decades of conflict, political turmoil, corruption, and inadequate infrastructure have been a hindrance to the effective exploitation of the resources. This paper examines the role of mining in Afghanistan's economic and political development, distilling the opportunities and challenges in the industry. Drawing on comparative case studies from resource-rich countries like Botswana and Chile, the study highlights the importance of open government, robust regulatory institutions, and strategic foreign partnerships. The evidence suggests that an efficiently operated mining sector would be a driver of sustainable development, provided that Afghanistan addresses deep-seated systemic evils in the form of corruption, insecurity, and environmental degradation. The research concludes with policy imperatives aimed at maximizing the contribution of the sector to national development.

Nur Aisyah; Roni Risky Nasution; Sopi Ade Fariza; Abdul Haris Nasution; Asrofi Asrofi +1 more

International Journal of Islamic Educational Research 2025 Asosiasi Riset Ilmu Pendidkan Agama dan Filsafat Indonesia

This article examines the synergy between Islamic theological values and local wisdom as a basis for resistance to environmental exploitation in Mandailing Natal. The focus of the study lies on the application of faith principles, such as the concepts of khalifah, justice, and ihsan, and their implementation through the traditional practice of lubuk larangan. The literature study method was used to collect and analyze secondary data from scientific articles, journals, and national and local news sources. The results of the study show that these Islamic theological values have been deeply rooted in the culture of the Mandailing Natal community, encouraging a critical attitude towards illegal gold mining practices that damage the ecosystem. The lubuk larangan tradition also acts as a mechanism for social control and environmental conservation, by implementing periodic restrictions on extractive activities to provide space for natural regeneration. The findings indicate that the integration of Islamic theology and local wisdom results in a more integrated and ethical natural resource management paradigm. This research recommends strengthening the synergy of faith values and local traditions in the formulation of public policies and increasing community participation in environmental monitoring. This integrative approach can be used as a strategic model to overcome the challenges of environmental exploitation amid increasingly complex global dynamics.

Detevince Butu; Endang Hartiningsih; Rahmat Indrajati

Manufaktur: Publikasi Sub Rumpun Ilmu Keteknikan Industri 2024 Asosiasi Riset Ilmu Teknik Indonesia

People's mining activities in Gamey Village, Uwapa District, Nabire Regency, Central Papua Province are carried out to meet daily needs and improve the welfare of the local community. This mining activity is based on alluvial deposit conditions and is applied for mining sediments on the surface and using alcon machines. for high pressure water spray. This community mining activity is divided into several stages starting from preparation of mining land, processing and production processes as well as selling gold products for sale. This research aims to examine the gold processing used by small-scale miners in Uwapa District, Gamey Village, and its impact on the environment and public health. The main focus of this research is on the use of the sluice box method, which is the gold processing technique most commonly used by local communities. This method was chosen for its simplicity and low cost, although the gold recovery efficiency varies between 50-70%. Additionally, this research evaluates alternative technologies such as shake tables and centrifuges that can increase gold recovery efficiency and be more environmentally friendly. The research results show that the implementation of alternative technology requires training, procurement of adequate equipment and infrastructure as well as ongoing monitoring. By adopting better technology, it is hoped that gold mining activities in Gamey Village can run more productively and sustainably, improving community welfare without damaging the environment.

Nailzidane Nefananda Dziban; Dyah Probowati

Proceeding of the International Conferences on Engineering Sciences 2024 Asosiasi Riset Ilmu Teknik Indonesia

Indonesia is an archipelagic country that has abundant mineral wealth, both metal minerals and other minerals. Metal minerals, including gold, tend to have a higher economic value. Based on data from the Ministry of Energy and Mineral Resources, the world's gold reserves in 2020 were 50,300 tons of Au. Indonesia is among the 5 largest in the world with 5% of the total gold reserves, which is 2,600 tons of Au. Therefore, it is necessary to develop technology and science in the mining industry, especially gold and silver, to improve the optimization of the process and increase the added value of the mining products themselves. One of the gold extraction processes can be done hydrometallurgically with the cyanidation method using a intensive leach test. The results of this experiment show that factors such as cyanide usage and ultra fine particle size will greatly affect the recovery of gold and silver metals.