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Tanco Mine
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<p>The Tanco Mine or Bernic Lake mine is an <a href="/facts/Underground_mining_(hard_rock)/w7oT1MWl">underground</a> <a href="/facts/Caesium/dXKN1S5k">caesium</a> and <a href="/facts/Tantalum/VwaxMm33">tantalum</a> <a href="/facts/Mining/g6uDIFab">mine</a>, owned and since 2019 owned and operated by <a href="/facts/Sinomine_Resource_Group/Q31t5oAj">Sinomine Resource Group</a> on the north west shore of <a href="/facts/Bernic_Lake/gXKpCm0q">Bernic Lake</a>, <a href="/facts/Manitoba/QuCdIDYB">Manitoba</a>, <a href="/facts/Canada/cWWFM8oc">Canada</a>. The mine has the largest known deposit of <a href="/facts/Pollucite/qClNH6uX">pollucite</a> and is also the world's largest producer of <a href="/facts/Caesium/dXKN1S5k">caesium</a>. </p><p>The mine has the largest <a href="/facts/Tantalum/VwaxMm33">tantalum</a> reserves in <a href="/facts/Canada/cWWFM8oc">Canada</a> having estimated reserves of 2.1 million tonnes of ore grading 0.22% <a href="/facts/Tantalum/VwaxMm33">tantalum</a>. The mine also has additional reserves amounting to 7.3 million tonnes of ore grading 2.76% <a href="/facts/Lithium/7vXX6BWA">lithium</a>. The mine also produces <a href="/facts/Caesium/dXKN1S5k">caesium</a> brine, which is converted into <a href="/facts/Caesium_formate/Py3GhI7L">caesium formate</a> which is used mostly as additive for drilling fluids to increase the fluid's <a href="/facts/Density/92p6hh9I">density</a>. A concentrated solution of caesium formate has a density of 2.3 g/cm3. </p>