GEOLOGY AND ORE DEPOSITS OF THE OROGRANDE MINING DISTRICT, OTERO COUNTY, NM - 1982
Robert M. North
N.M. Bureau of Mines & Mineral Resources
Socorro, N.M. 87801
The orogrande (Jarilla, Silver Hill) mining district, located in the Jarilla Mountains (T 21, 22, s,, R. BE., Otero County, Fig. 1) is a past producer of gold, silver., copper, lead, iron and turquois. The ore deposits with the· exception of turquoise occur as late-stage veins and limestone replacement deposits in skarns associated with the intrusion of a Tertiary
.monzonite-quartz monzonite stack complex. The turquoise was formed during the supergene alteration of the stock.