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Placer Gold Deposits. Placer Deposits, or Secondary Gold Deposits, are the easiest and most cost-effective to mine. They are formed when gold is eroded by weather (temperature, wind, water) over millions of years from its source rocks.
Placer deposits result from weathering and release of gold from lode deposits, transportation of the gold, and concentration of the gold dominantly in stream gravels. Unless preserved by burial, a placer subsequently may be eroded, and either dispersed or reconcentrated.
10 lut 2016 · This map shows most of the historically and currently producing placer gold districts of Nevada. Nevada is well known as the top U.S. producer of lode gold, but did you know Nevada also has placer gold deposits?
Placer gold deposits of Utah, USGS Bulletin 1357, 26 p., 1 pl., 1:1,000,000, 1973. Describes eighteen placer districts with map coverage, accessibility, extent, production history, gold source, and references for each location.
9 sty 2018 · The richest placer deposits occur between these parts of the river, fed by gold eroded from uplifted paleoplacers (Fig. 1a). Gold enrichment in such placers is a result of sediment accumulation followed by removal of most of that sediment during subsequent storms to leave a gold-rich residue (Fig. 1 c, e).
Placer Gold deposits in New Mexico. Placer gold deposits were an important source of gold in New Mexico prior to 1902, but placer production after 1902 has been minor. The earliest reports of placer mining were in the 1600s along the northern Rio Grande.
PLACER GOLD DEPOSITS OF ARIZONA By MAUREEN G. JoHNsoN ABSTRACT Eighty-seven placer districts in Arizona are estimated to have produced a mini mum of 564,052 ounces of placer gold from 1774 to 1968. The location, areal extent, past production, mining history, and probable lode source summarized for each
