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Silver-bearing ore typically contains very little silver, with much higher percentages of copper and lead. Specific minerals include argentite (Ag 2 S), chlorargyrite ("horn silver," AgCl), polybasite (Ag, Cu) 16 Sb 2 S 11), and proustite (Ag 3 AsS 3). [2] Silver mainly occurs as a contaminant in chalcopyrite and galena, important ores of ...
Silver occurs in veins filling fracture zones through Paleozoic limestone. Minerals in the silver-ore veins include polybasite, pyrargyrite, proustite, sphalerite, galena, and tennantite. Manganese occurs as replacement bodies of pyrolusite and rhodochrosite in limestone adjacent to the fracture zones. No mines are presently active in the ...
Silver ore was first discovered in west-central Arizona in 1583 by Spanish explorer Antonio de Espejo, but no mining resulted.Again in 1598, Juan de Oñate led another expedition searching for Espejo’s silver; many claims were staked, but the expeditioners returned to Santa Fe without mining any silver, and the deposits remained unexploited.
The ore was first extracted through surface diggings, but these were quickly exhausted and miners had to tunnel underground to reach ore bodies. Unlike most silver ore deposits, which occur in long thin veins, those of the Comstock Lode occurred in discrete masses often hundreds of feet thick.
The silver deposits of the Reese River mining district were discovered in 1862. The town of Austin was established, and in 1863 became the county seat of the newly formed Lander County. By 1867, there were 11 ore-processing mills in the district. The ore deposits are veins in quartz monzonite and quartzite. [3]: 114–116
Ore occurs in the Mississippian Leadville Limestone and the lower part of the overlying Pennsylvanian Belden Formation. Ore minerals include galena, sphalerite, and native silver. Early production was almost all silver, but after 1900, lead and zinc became economically important. Major mining operations continued until 1952.
These low frequency waves will respond differently based on the material they pass through, allowing for analysts to create three-dimensional images of potential ore bodies or volcanic intrusions. This technique is used for a variety of prospecting, but can mainly be for finding conductive materials. [8]
The three partners formed the Tombstone Gold and Silver Mining Company to hold title to their claims. [5] Gird built a crude assay furnace in the cabin's fireplace. He found that Schieffelin's initial find of silver ore was valuable, but within a few weeks of mining the vein, Ed discovered it ended in a pinch about three feet deep.