Nickel and nickel alloy consumption other than electroplate and stainless steels (year ended June 1972) Copper and copper alloys 21,600,000 kg of copper and alloy pipe and tube (year ended
Total resources for purposes of these appraisal estimates include currently minable resources (reserves) as well as those resources not yet discovered or not currently profitable to mine. The mining of mineral deposits, once they are discovered, depends on geologic, economic, and technologic factors; however, identification of many deposits yet to be discovered, owing to incomplete knowledge of their distribution in the Earth's crust, depends greatly on geologic availability and man's ingenuity. Consequently, appraisal of mineral resources results in approximations, subject to constant change as known deposits are depleted, new deposits are found, new extractive technology and uses are developed, and new geologic knowledge and theories indicate new areas favorable for exploration. This Professional Paper discusses aspects of the geology of fluorine as a framework for appraising resources of this commodity in the light of today's technology, economics, and geologic knowledge. Other Geological Survey publications relating to the appraisal of resources of specific mineral commodities include the following:
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