Newmont gold, situated on the Carlin Trend, has a historic claim in Nevada. In 1962 Newmont’s discovery of the Carlin deposit marked the beginning of one of the largest gold mining districts in the world. More than 50 years after its first exaction, several new mines have been established and continue to operate today.
Newmont operates multiple sites along the Carlin Trend; all mine exclusively gold. Current operations consist of three open pits and four underground mines. Collectively, Newmont’s Carlin operation is the largest in Nevada, with annual gold production of 944,000 ounces (US$1.2 billion as of 2016).
The site runs 54 haul trucks, ranging from 150 to 250 tones capacity, 6 shovels, 5000 employees and contractors. Gold grains ranges from less than 0.1 to 10.0 micron (microscopic), which is characteristic of Carlin-type deposits. Processing technologies used are standard for low-grade, specifically cyanide heap leaching technique, as described in previous entry.
The Gold Quarry operation is the largest of the Carlin mine and one of the largest gold deposits in North America. Located on a regional anticline, an area where rocks have been folded downwards by
tectonic forces, resulting in older deeper rocks rising to the surface. Conveniently, uplift of deep, gold-bearing rocks, allow for more efficient mining as pits are not required to mine at depths where ore would naturally be found. Furthermore, a shallower mine would avoid the waste involved with deep-pits and less landscape alteration.
The Genesis projects located further north in the basin and range province, an area of periodic
elevation and depression (geologically known as horst and grabens) caused by the pull of a
subducting tectonic plate to the west. The project has seen recent plans for expansion and
revival of a pit mine in the area, with an expected reserve of 3 million ounces. The new project
has been permitted to mine 650 million tons as of 2015.