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Montezuma District, Park Co., Colorado, USA

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Location is approximate, estimate based on other nearby localities.
Latitude & Longitude (WGS84): 39° North , 105° West (est.)
Margin of Error:~5km
Köppen climate type:Dfc : Subarctic climate

The ore deposits of the Montezuma district are meso-thermal veins containing gold and silver, sulfides of lead, silver, zinc, arsenic, antimony, copper, and bismuth, and their supergene alteration products. Within the northern and central parts of the stock high-grade silver veins have been found, such as the Winning Card and American Eagle, but the ore shoots discovered have been small and narrow. Thus far no large output has come from deposits of this type. In the south-central part of the stock, intersecting but nonpersistent fractures contain sphalerite and galena with little gangue, though locally silver is an important constituent. Ores composed of barite and gray copper are abundant in a southeasterly branch of the mineral belt extending from Glacier Mountain to Hall Valley. These ores contain galena, sphalerite, and pyrite, and rich silver minerals are commonly associated with them. In both the Hall Valley and Geneva Gulch areas veins containing bismuth and silver are common and are associated with chalcopyrite in a quartz gangue. East of Montezuma and southeast of the Montezuma stock, in the Silver Wave-Pennsylvania vein system and the nearby parallel veins, substantial quantities of both gold and silver are present in the chalcopyrite-sphalerite-galena ores. Quartz and ankerite are the chief gangue minerals and barite is scarce. Throughout the district, however, the gangue minerals commonly make up a relatively small part of the vein matter in ore shoots. The veins in the southern part of the Montezuma stock consist chiefly of sphalerite and pyrite and contain only moderate amounts of galena and quartz-ankerite gangue.

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Mineral List

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64 valid minerals. 3 (TL) - type locality of valid minerals.

Rock Types Recorded

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Localities in this Region

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