Mine detail: Mansfield Claim

Previously called 'Expectation Group'

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Location

Lat / long:

33.12621, -109.33065

Resource(M)

Primary:	Copper
Secondary:	Silver, Gold
Ore:	Malachite
Gangue:	Epidote, Orthoclase, Quartz
Orebody form:	POCKET
Discovery year:	1875

Production

Operation type:	Unknown
Deposit type:	Vein
Production size:	Small
Development status:	Producer

Geology

Host type:	Granite
Associated rock:	Morenci Granite Porphyry;Precabrian Granite-Granodiorite Complex
Associated type:	Plutonic Rock
Structure:	Ne-Trending Narrow Porphyry Dikes In Coarse Reddish Quartzitic Granite; Veins Consist Of Many Very Sharply Defined Fissure Planes Striking Nne, Granite Country Rock Fragmented By Small Dike Of Basalt Or Andesite; Volcanic Dike Fractures Porphyry Dike Aout 15 Feet Below Surface
Tectonic:	Copper King Massif; Block Faulting Nw Of Massif With Downthrow Of About 1000 Ft
Alteration processes:	Surface Oxidation To Unknown Depths; Porphyry Greatly Bleached By Sericitization And Extensively Cemented By Quartz Veinlets

References

MRDS	M001271
DEP	10026952
Reference	{Deposit:: LINDGREN, 1905, USGS PROF PAPER 43, P. 362-263}{Deposit:: WEED, 1914, THE COPPER HANDBOOK, V. 11, P. 648, NEW ENGLAND AND CLIFTON COPPER CO}{Deposit:: STEVENS, 1911, THE COPPER HANDBOOK, V. 10, P. 1284-1285, NEW ENGLAND AND CLIFTON COPPER CO}{Deposit:: BENNETT, 1975, GEOLOGY AND ORIGIN OF THE BRECCIAS IN THE MORENCI-METCALF DISTRICT, GREENLEE COUNTY, ARIZONA: M.S. THESIS UNIVERSITY OF ARIZONA, 153 P.}
Reporter	Johnson, Kris H. (Creasey, S.C.), Calder, Susan R.