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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  30-Nov-96 by Keith J. Mountjoy(KJM)

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NMI 082E5 Mn2
Name MO RHODONITE, OROFINO CREEK Mining Division Osoyoos
BCGS Map 082E022
Status Showing NTS Map 082E05E
Latitude 49º 15' 48" N UTM 11 (NAD 83)
Longitude 119º 37' 04" W Northing 5460028
Easting 309550
Commodities Rhodonite, Gemstones Deposit Types Q02 : Rhodonite
F01 : Sedimentary Mn
Tectonic Belt Intermontane Terrane Okanagan
Capsule Geology

The Mo rhodonite occurrence is located 5 kilometres east- northeast of the peak of Orofino Mountain, 18 kilometres northeast of Keremeos, British Columbia and 10 kilometres southeast of Twin Lakes.

The Mo Rhodonite occurrence is located within the Intermontane Belt near its eastern boundary with the Omineca Belt. The Mo occurrence is underlain primarily by a west to northwest striking and 70 to 80 degree southwest dipping sequence of chert and greenstone of the Carboniferous to Triassic Old Tom and Shoemaker formations. The Old Tom rocks include basaltic and andesitic (greenstone) flows dipping steeply to the north, and minor related diorite. The Shoemaker Formation consists of chert, with small amounts of tuff, greenstone, and limestone. To the south and west, these rocks are intruded by Middle Jurassic to Cretaceous gabbroic to granitic rocks of the Nelson and Oliver plutonic complexes and the Fairview pluton. To the north, Eocene Marron Formation basalts are faulted against the older rocks by the easterly trending McCaig Creek fault.

Rhodonite occurs in cherts of the Shoemaker Formation at the Mo occurrence. The rhodonite has been explored by old workings of unknown age. Further to the west at the Orofino Mountain occurrence (082ESW113), rhodonite occurs with quartz as irregular replacement zones in the Shoemaker Formation. The largest lens is 75 metres long by up to 1 metre wide.

Bibliography
EMPR OF 1989-5
GSC MAP 341A; 538A; 539A; 541A; 15-1961; 1736A; 2389
GSC MEM 38; 179
GSC OF 481; 637; 1505A; 1565; 1969
GSC P 37-21; 72-53, p. 58
GCNL #18, 1985
Canadian Rockhound Feb., 1966, page 9

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