However, we are aware that cobalt is present in the area and we welcome further information on these sites. Mine La Motte in Missouri and the Stone Corral project in California were not included because of a lack of ore reserve information in publicly available references. Analyses of rock chips from 47 outcrops of the Katahdin deposit in Maine indicates that the deposit locally contains approximately 0.1 percent cobalt (Miller, 1945), but a thorough analysis of the deposit is lacking. The Stillwater deposit in Montana produced cobalt, but this was a byproduct, and to our knowledge, there are no published records of the amount of cobalt produced, or the amount of cobalt contained within the deposit. A prime example is the Bunkerville project in Nevada (Ludington and others, 2006). Several deposits and prospects were not included in this database, because they contain less than 1,000 metric tons of cobalt. These deposits and prospects occur in Alaska, California, Idaho, Maine, Michigan, Minnesota, Missouri, Montana, North Carolina, New Mexico, Oregon, Pennsylvania, Puerto Rico and Tennessee. Rather, these entries were included to capture the characteristics of the deposits and prospects in the United States and its territories that have the largest cobalt resources. The inclusion of a particular mineral deposit or prospect in this database is not meant to imply that it has economic potential. In the United States, cobalt could be derived as a byproduct from mineral deposits that primarily produce other metals, including nickel, copper, zinc, and lead.
Cobalt mineralogy is diverse it occurs in a variety of sulfide, arsenide, sulfarsenide, and oxyhydroxide minerals. In 2017, the United States had a net import reliance as a percentage of apparent consumption of 72 percent for cobalt, and cobalt is considered a critical mineral. The primary uses for cobalt are in rechargeable battery electrodes, and in superalloys used to make gas turbine engines. Cobalt has diverse uses because of its properties, which include ferromagnetism, hardness, wear-resistance, low conductivity, and high melting point. To focus the scope of this data release, we report only mined deposits and exploration prospects with past production, or resource and reserve estimates of 1,000 metric tons or more of cobalt.
This made cobalt, along with lapis lazuli, one of the few mineral blue pigments, and therefore was an extremely valuable commodity. Its primary historic use was as a pigment used especially in glass or porcelain, as it turns a rich "cobalt blue" when in the compound form of smaltite, made of cobalt, iron, and nickel combined with arsenic. Pure cobalt is an element found on the periodic table just after iron, and is actually silver-like in color, however it is never found pure in nature. It is named after the Kobold, at that time thought of as a mischievous spirit this is because smelting its ores were difficult and would often release toxic fumes. Actual Cobalt is a poisonous, magnetic metal (though it is actually a key part of vitamin B12, which is necessary for living beings and has extremely low toxicity).
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