In the late 19th century, the United Verde Mine, developed by William A. Clark, extracted ore bearing copper, gold, silver, and other metals from the larger of the two.
Between the 16th and 18th century (and even before), the establishment of copper- and iron-works was closely related to the supply of wood types suitable for charcoal making and, to a lesser extent, on the occurrence of ore bearing rock, which often had to be transported over long distances to the works (Curtze 1850; Seidensticker 1896; Wick 1910; Rippel 1958; Schäfer 1977; Boucsein 2009).
They now mostly extract uranium by in-situ leaching (ISL), which pumps alkali or a weak sulphuric acid solution into an isolated, ore-bearing stratum and recovers the mineral in suspension.
Such calcite constitutes the cement for many clastic sediments e.g., some sandstones and also the calcite or aragonite of speleothems and of both calcite and calcitic ore-bearing veins.
Among the rocks above the escarpment are the ore-bearing Northampton Sands, which yielded a low-grade iron ore and were once extensively worked.
Calcite is also the chief component of marls, travertines, calcite veins, most speleothems (cave deposits), many marbles and carbonatites, and some ore-bearing veins.
Water entrapped in limestone, in marlstone, in ore-bearing clays, in ammonites was regarded a beneficial power, the foundation for all creatures.
The strongest workers handled picks at the ore face, weaker men or boys carried ore from the mine, and women and old men sifted the ore-bearing rock.
He has found that microwaving ore-bearing rocks can disintegrate them as effectively as grinding them up, but at half the cost in energy.
The ore-bearing domain, in contrast, is characterized by a complex internal architecture, variations in whole-rock and mineral compositions, and the presence of numerous inclusions and xenoliths.
The fillings of the ore-bearing veinlets typify the products of hydraulic fracture and both types of mineralization took place concurrently with regional contraction.
