Honduras Geology (updated
1/25/9)
GOLD IN SKARN, MINAS DE ORO, HONDURAS. [abstr.]: in Journal
of the Alabama Academy of Sciences, 69(2), p. 84, April 1998.
Michael G. Bersch, School of
Mines and Energy Development, University of Alabama, Tuscaloosa, AL 35487-0164.
John E. Hiner, Champion Resources, Inc., 205-409 Granville St., Vancouver,
BC V6C 1T2, Canada.
During 1996, Champion Resources, Inc., in connection with
other Canadian exploration companies, conducted exploration for gold in
and around Minas de Oro, Honduras. The project area covered approximately
97 km2. The stratigraphy in the project area is Jurassic Todos Santos
Formation, consisting of conglomerates, red beds, and carbonate-cemented
sands overlain by Cretaceous Yojoa limestones which are, in turn, overlain
by Cretaceous Valle de Angeles Group, another sequence of red beds and
limestones. This sequence has been intruded by Tertiary(?) Minas
de Oro granodiorite and later feldspar porphyry. Copper-gold mineralization
occurs in skarn at the base of the Yojoa limestone in numerous places within
the project area. Skarn consists of very fine-grained siliceous endoskarn
to massive medium-grained garnet exoskarn. Deep weathering and oxidation
have occurred in some areas where skarn has been fractured and subaerially
exposed. Primary mineralization occurs as massive sulfide (pyrite-pyrrhotite-chalcopyrite)
replacement of Yojoa Limestone, and quartz-pyrite-pyrrhotite-chalcopyrite
veins, veinlets, and breccia fill in Todos Santos conglomerates and sands.
In unoxidized skarn, gold occurs as irregular grains of electrum along
mineral-grain boundaries and as encapsulated grains in oxides and sulfides.
Although Champion has withdrawn from the project other companies continue
exploration and testing of this interesting copper-gold skarn.
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