Mineral Resources of the United States, 1917--Part I--Metals . en the price of quicksilver was low, but it isdoubtful whether under any conditions that can now be foreseen itwill be profitable to reopen and work the deep levels of this ground at that depth is difficult to hold and mining is interferedwith by abundant water and gas. Although most of the known quicksilver deposits (PI. II) are inregions of geologically late volcanic eruptions, it is probable that oresof quicksilver were deposited during or closely following epochs ofsimilar igneous activity in the older geologic periods
Mineral Resources of the United States, 1917--Part I--Metals . en the price of quicksilver was low, but it isdoubtful whether under any conditions that can now be foreseen itwill be profitable to reopen and work the deep levels of this ground at that depth is difficult to hold and mining is interferedwith by abundant water and gas. Although most of the known quicksilver deposits (PI. II) are inregions of geologically late volcanic eruptions, it is probable that oresof quicksilver were deposited during or closely following epochs ofsimilar igneous activity in the older geologic periods, but that manyof them have been removed by erosion. Some of the deposits in theolder rocks, which do not appear to be related to Tertiary or latervolcanic eruptions, may have had such earlier origin. The quicksilver deposits of the Adriatic region in Europe, includ-ing those at Idria in Austria, Avala in Serbia, and Monte Amiata inItaly, have been shown by De Launay to belong to a single metallo- S. GEOLOGICAL SURVEY MINERAL RESOURCES, 1917, PART I PLATE II. 95180—M R 1917, pt I. (To face paste 386.) MAP SHOWING THE LOCATION OF THOSE QUICKSILVER DEPOSITS OF THE WORLD SOME OUTPUT FROM WHICH IS o.\ RECORD. QUICKSILVER. 387 genetic province characterized by Tertiary eruptions. Similarly, thesomewhat scattered occurrences of quicksilver in Alaska, Washing-ton, Idaho, Montana, Oregon, Nevada, Utah, California, Arizona,Mexico, Peru, and Chile coincide in part with the belt of Tertiaryand Quaternary volcanic activity along the western sides of the con-tinents of North America and South America. Future work maysubdivide this belt into two or more provinces as regards the genesisof the quicksilver deposits, but existing knowledge is insufficient forsuch distinction. The deposits at Almaden, Spain, in the DonetzBasin, Russia, in Asiatic Turkey, and in China appear to be isolatedoccurrences that can not at present be assigned to recognizable prov-inces of eruptive activity and metalliz
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