Abstract A new quantitative mineral resource assessment for tungsten, a critical mineral commodity with highly concentrated production and a moderate risk of global supply disruption, was conducted for the Great Basin region of western Nevada and eastern California. This assessment was part of a larger effort focusing on three regions in the United States and represents the first study of domestic tungsten resources and mineral potential in over twenty years. By integrating geology, bedrock and stream sediment geochemistry, geophysics, and remote sensing data with recently developed software tools and analyses, estimates of undiscovered tungsten skarn deposits in permissive tracts are combined with grade and tonnage distributions of known deposits to generate probabilistic estimates of undiscovered resources. Identified resources in the Great Basin region total 168 thousand metric tons (kt) of tungsten trioxide (WO3), including 116 kt of past production and 52 kt remaining in place. Consistent with the historic significance of the Great Basin region as a past producer containing a large portion of U.S. identified resources, undiscovered resources are likely to occur adjacent to known deposits and prospects and at unexplored depths. Undiscovered deposits are estimated to contain median resources of 940 kt of WO3 with a 90% probability of at least 420 kt and a 10% probability of at least 1.7 million metric tons (Mt), of which 240 kt to 1.1 Mt may be economic to extract. Based on a 20-year average price, median recoverable undiscovered resources are estimated at 570 kt WO3 equivalent with a net present value of $3 billion U.S. dollars. The methods, data, results, and economic significance of the assessment contribute to a scientific understanding of a critical mineral resource with direct implications for policy and land management decisions.

中文翻译：

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内华达西部和加利福尼亚东部大盆地地区的钨矽卡岩矿产资源评估

摘要 钨是一种生产高度集中、全球供应中断风险中等的重要矿产商品，针对内华达州西部和加利福尼亚州东部的大盆地地区进行了一项新的定量矿产资源评估。该评估是针对美国三个地区的更大努力的一部分，代表了二十多年来对国内钨资源和矿产潜力的首次研究。通过将地质学、基岩和河流沉积物地球化学、地球物理学和遥感数据与最近开发的软件工具和分析相结合，将许可区内未发现的钨矽卡岩矿床的估计与已知矿床的品位和吨位分布相结合，以生成对未发现资源的概率估计. 大盆地地区已查明的三氧化钨 (WO3) 资源总量为 16.8 万吨 (kt)，其中过去生产的 116 kt 和剩余的 52 kt。与大盆地地区作为包含大部分美国已识别资源的过去生产商的历史意义相一致，未发现的资源很可能出现在已知矿床和前景附近以及未勘探的深度。据估计，未发现的矿床含有 940 kt WO3 的中位数资源，其中 90% 的概率至少为 420 kt，10% 的概率至少为 170 万公吨 (Mt)，其中 240 kt 至 1.1 Mt 可能是经济的提炼。根据 20 年平均价格，未发现的可采资源中位数估计为 570 kt WO3 当量，净现值为 30 亿美元。方法、数据、