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Y&X Beijing Technology Co., Ltd.
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Y&X Beijing Technology Co., Ltd,is a professional metal mine beneficiation solution provider, with world-leading solutions for refractory beneficiation. Over the years, we have accumulated rich successful experience in the fields of copper, molybdenum, gold, silver, lead, zinc, nickel, magnesium, scheelite and other metal mines, rare metal mines such as cobalt, palladium, bismuth and other non-metal mines such as fluorite and phosphorus. And can provide customized beneficiation solutions ...
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Cyanide Leaching: How do you determine the optimal parameters for temperature, time, and concentration?
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Increasing the grinding fineness appropriately can enhance the leaching rate. However, over-grinding not only raises milling costs but also increases the likelihood of leachable impurities entering the leach solution, leading to the loss of cyanide or leaching agents and dissolved gold. To determine the appropriate grinding fineness, a grinding fineness test must be conducted first. Pretreatment Agent Selection Test Gold ore leaching often requires pretreatment agent selection tests. Common agents like calcium peroxide, sodium hypochlorite, sodium peroxide, hydrogen peroxide, citric acid, and lead nitrate are compared with conventional methods where no pretreatment agent is used, aiming to determine if pretreatment is necessary. Calcium peroxide, sodium hypochlorite, and sodium peroxide are stable and widely used multifunctional inorganic peroxides, characterized by prolonged oxygen release, which helps improve gold leaching rates in leach slurry. Hydrogen peroxide and citric acid supply sufficient oxygen during the leaching process as the main oxygen-generating agents. Lead nitrate’s lead ions (in appropriate amounts) can destroy the passivation film on gold during cyanide leaching, speeding up gold dissolution, reducing cyanidation time, and increasing the leaching rate. Protective Alkali and Lime Dosage Test To stabilize the sodium cyanide solution or non-toxic leaching agents and minimize chemical losses, a suitable amount of alkali must be added to the leach to maintain a certain slurry alkalinity. Within a certain range, as alkali concentration increases, the gold leaching rate remains constant while the leaching agent dosage decreases accordingly. However, excessive alkalinity slows gold dissolution and reduces the leaching rate, necessitating determining the optimal alkali dosage and slurry pH. In tests and production, widely available and low-cost lime is usually used as the leaching protective alkali. This helps determine the specific dosage needed for practical production. Leaching Agent Dosage Test In the gold leaching process, the leaching agent dosage is directly proportional to the gold leaching rate within a certain range. However, excessively high dosages not only raise production costs but also have little impact on further increasing the leaching rate. Therefore, based on the grinding fineness test, a leaching agent dosage test is conducted to determine the optimal dosage, further lowering agent consumption and production costs. Leaching Time Test To achieve high leaching rates, extending leaching time is a common practice, allowing complete gold dissolution and maximizing leaching efficiency. As leaching time increases, the gold leaching rate gradually rises until it stabilizes. However, prolonged leaching time also dissolves and accumulates other impurities in the slurry, hindering gold dissolution. A leaching time test is conducted to determine the optimal duration. Slurry Concentration Test During leaching, the slurry concentration directly affects the gold leaching rate and speed. Higher concentrations result in higher viscosity and lower fluidity, reducing both the gold leaching rate and speed. Conversely, too low a concentration increases leaching efficiency but also necessitates larger equipment and higher investment, while proportionally increasing reagent dosages and production costs. A slurry concentration test is conducted to determine the optimal leach slurry concentration. Activated Carbon Pretreatment Test For the carbon-in-leach (CIL) method, hard and wear-resistant activated carbon must be used to avoid fine carbon particles entering the tailings due to abrasion during stirring, leading to gold loss and reduced recovery rates. The test typically uses coconut shell activated carbon with a particle size of 6-40 mesh. The pretreatment conditions involve a water-to-carbon ratio of 5:1, stirring for 4 hours at 1700 RPM. The carbon is then screened using 6-mesh and 16-mesh sieves, removing fine particles below 16 mesh. The selected carbon (6-16 mesh) is used for carbon leaching and adsorption tests. Base Carbon Density Test In gold ore leaching tests, 6-16 mesh coconut shell activated carbon is usually selected to adsorb and recover dissolved gold, yielding gold-loaded carbon, which is then subjected to mature carbon desorption and electrowinning to produce finished gold. The base carbon density directly impacts adsorption efficiency. A base carbon density test is conducted to determine the optimal density. Carbon Adsorption Time Test To determine the appropriate carbon leaching (adsorption) time and minimize wear on gold-loaded carbon, a pre-leaching and carbon leaching (adsorption) time test is needed after determining the total leaching time. Comprehensive Carbon Leaching Process Test To verify the stability of the carbon leaching process and the reproducibility of test results, a comprehensive parallel test of the entire carbon leaching process is conducted. After determining the optimal conditions in the above nine tests, the final integrated validation test is performed. This completes a full-scale test study for carbon slurry leaching in gold ore processing. Depending on actual production needs, additional tests may include tailings (barren solution) recycling trials or measuring carbon leaching residue settling rates.
🔍 Copper-Molybdenum Ores: How to Crack the "Low-Grade, Fine-Grained, and Complex" Challenge?
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Perpetua makes tungsten discovery at Gold-Stibnite project in Idaho
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2026

08/10

Costa Rica tests mining ban with Crucitas revival
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Fernández, who took office on May 8 after winning February’s presidential election in the first round, moved quickly to elevate Bill 24.717 by including it in the Legislative Assembly’s extraordinary-session agenda just four days after her inauguration. The measure would permit gold exploration and mining only in the 84,800-hectare district of Cutris de San Carlos, home to the Crucitas deposit, while preserving Costa Rica’s broader ban on open-pit metal mining elsewhere in the country. The move marks a sharp reversal for a country that has built much of its international reputation on conservation, ecotourism and sustainable development. Government officials argue the current prohibition has failed to stop mining activity at Crucitas, instead allowing illegal operators to expand, often using mercury and cyanide without environmental controls. Juan Ignacio Guzmán, CEO of GEM Mining Consulting, said the debate is increasingly centred on governance rather than mining itself, noting that Costa Rica already maintains an active non-metallic mining industry supplying aggregates, limestone, silica and other industrial materials used in construction and infrastructure. Eduardo Zamanillo and Marta Rivera, analysts at Geopolitical Mining, argue that Crucitas reflects a broader challenge they describe as “anomic mining”: situations where formal mining rules remain in place but no longer govern what is happening on the ground. In their view, the debate is less about mining versus conservation and more about whether the state can manage mineral extraction better than illegal networks already operating in the area. The proposed legislation would award mining concessions through public auctions administered by the Directorate of Geology and Mines under the Ministry of Environment and Energy. Companies would have to demonstrate technical expertise, financial capacity and a satisfactory environmental record before qualifying to bid. The bill also proposes a minimum 5% royalty on gross mineral sales, with most revenues flowing to the central government (over 70%) while municipalities and local development associations receive smaller allocations. Juan Carlos Guajardo, executive director of mining consultancy Plusmining, said the government’s argument that regulated mining could reduce environmental damage is plausible but far from guaranteed. Formal mining operations can operate under significantly higher environmental standards than illegal miners through engineered tailings facilities, water-management systems, chemical controls and legally enforceable closure plans. He warned that successful displacement of illegal mining requires broader measures including territorial control, enforcement against criminal networks, gold traceability systems and alternative economic opportunities for people currently dependent on informal mining. “The challenge is not simply replacing illegal mining with legal mining,” Guajardo said. “The deeper question is whether Costa Rica can transform an environmental liability that contradicts its development model into an opportunity to generate economic value, restore damaged ecosystems and reinforce its sustainability credentials.” Political battle Despite the government’s push, the legislation remains far from becoming law. The bill has already cleared committee review and won an endorsement from the Special Committee of Alajuela in September 2025. It is now before the legislative plenary, where opposition lawmakers have filed hundreds of delaying motions. Opposition remains fierce. Members of the left-wing Frente Amplio party and factions within the Partido Liberación Nacional argue that reopening open-pit mining would threaten sensitive ecosystems and undermine decades of environmental policy. Environmental organizations have likewise mobilized against the proposal. The debate is also influenced by the legacy of Canadian miner Infinito Gold. The company’s concession was annulled by Costa Rica’s courts in 2010, the same year lawmakers voted to ban new open-pit metal mining. Infinito subsequently pursued international arbitration against the state. That dispute ended in Costa Rica’s favour with an international tribunal declining to award Infinito damages in 2021. The company abandoned its bid to annul the ruling in 2024, removing a major legal uncertainty surrounding the project. Officials now view the ruling as an opportunity to reconsider development of the deposit under a new framework. Zamanillo and Rivera said the Infinito dispute illustrates how mining risk extends beyond permits and contracts. A project can satisfy legal requirements yet still become politically and socially unsustainable if public opinion, courts or governments shift course. Fernández has suggested she may seek a national referendum if lawmakers reject the bill. The prospect of a public vote serves both as a possible route around legislative gridlock and as leverage on undecided lawmakers. The administration believes its arguments on employment, local economic development, public security and illegal mining could resonate with voters. Investor signal For mining investors, the significance of the proposal extends beyond the Crucitas deposit itself. Costa Rica has long ranked among the least accessible jurisdictions for metallic mining in Latin America. The government’s willingness to reconsider its longstanding prohibition sends a signal that the country may be open to resource investment under carefully controlled conditions. Guzmán said Crucitas is significant by Costa Rican standards but remains modest compared with many of Latin America’s largest undeveloped gold projects. Guajardo agreed, describing Crucitas as a mid-sized gold project rather than a world-class discovery on the scale of major Andean deposits. Even so, he said the project could attract serious industry attention if legal barriers are removed. Earlier studies found the deposit economically viable when gold prices were trading in the $1,000–$1,300 range versus today $4,000 an ounce levels, suggesting the asset could become attractive again under the right regulatory conditions. Guajardo said major mining companies would likely apply a substantial political and ESG discount to any evaluation of Crucitas because of its history of litigation, environmental controversy, reputational damage and illegal mining activity. While juniors and mid-tier producers could show interest, many larger operators would likely require greater legal and security assurances. Zamanillo and Rivera said passage of Bill 24.717 would likely be viewed as an important signal that Costa Rica is willing to reopen the mining discussion. However, they cautioned that legislative approval alone would not materially change perceptions of regulatory risk. Guzmán likewise believes the project’s greatest test lies in governance rather than geology. “The key question is whether the government can secure the area, reduce illegal mining, enforce environmental standards and identify an operator capable of financing long-term compliance and remediation,” he said. Costa Rica’s environmental sensitivity means any future project would face intense scrutiny. “Companies would not evaluate Crucitas like a conventional project in Peru, Ecuador or Chile,” Guzmán said. “They would price in constitutional risk, litigation risk, security concerns, environmental liabilities and the possibility of future policy reversals.” Guajardo also questioned whether the proposed concession auction, which emphasizes royalty bids, would attract the most qualified operators. He warned that, while politically attractive, systems focused primarily on maximizing royalties can favour aggressive bidders with optimistic assumptions rather than technically capable companies with strong environmental and social performance records. “In a project as sensitive as Crucitas, technical competence, environmental performance, financial strength, mine-closure capacity and understanding of Costa Rica’s institutional realities should carry at least as much weight as the economic offer,” he said. Environmental test The broader debate reflects a growing challenge facing governments across the Americas as they attempt to balance resource development, environmental protection and economic growth. Guzmán argued that legal mining alone is unlikely to eliminate illegal activity. Drawing on examples from Peru and Colombia, he said illegal operators often relocate unless governments simultaneously strengthen enforcement and improve gold traceability systems. Guajardo of Plusmining believes the environmental threshold for public acceptance will be exceptionally high and argued that a future concessionaire may need to help finance restoration of areas already damaged by illegal mining in order to build credibility with the public. “The company that eventually develops Crucitas may need to act not only as a mining operator, but also as an agent of environmental restoration, institutional rebuilding and public trust,” Guajardo said. Zamanillo and Rivera caution that Costa Rica’s greatest reputational risk may not come from formal mining itself, but from failing to control an illegal mining economy that continues to damage forests, waterways and local communities outside regulatory oversight. They argue the government must clearly distinguish between accountable, regulated mining and what they describe as anomic extraction if it hopes to preserve the country’s conservation credentials. Whether Bill 24.717 succeeds or fails, Fernández has already changed the conversation. The debate now extends far beyond a single gold project. It has become a test of whether Costa Rica can restore environmental and institutional control over a territory already affected by illegal mining while preserving the conservation-focused identity that underpins much of its international reputation. If successful, Crucitas could become a model for how governments address environmentally damaging illegal extraction through formal regulation, enforcement and remediation. If it fails, critics say it could reinforce concerns that mining and conservation-led development remain fundamentally incompatible. The outcome could shape not only the future of Crucitas, but also how investors assess Costa Rica’s long-term regulatory credibility and political risk. source:https://www.mining.com/costa-rica-tests-mining-ban-with-crucitas-revival/

2026

08/10

Indonesia resumes exporting products that may contain rare earths
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2026

08/07