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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  08-Mar-1990 by George Owsiacki (GO)

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NMI 092F15 Cu1
Name MARBLE BAY (L.154), MARBLE BAY, MARBLE BAY FR. NO. 2 (L.157) Mining Division Nanaimo
BCGS Map 092F078
Status Past Producer NTS Map 092F15E
Latitude 049º 45' 24'' UTM 10 (NAD 83)
Longitude 124º 33' 30'' Northing 5512742
Easting 387758
Commodities Copper, Gold, Silver, Molybdenum Deposit Types K01 : Cu skarn
Tectonic Belt Insular Terrane Wrangell
Capsule Geology

Northern Texada Island is underlain by Karmutsen Formation pillowed and massive basaltic flows with thick units of pillowed breccias conformably overlain by massive limestone of the Quatsino Formation, both formations of the Upper Triassic Vancouver Group. Various stocks and minor intrusions (Middle Jurassic) ranging in composition from gabbro through diorite to quartz monzonite, intrude the volcanics and limestones, and are locally associated with iron and copper-gold skarn mineralization. A major episode of folding (F1) has resulted in the limestones and, to a lesser extent, the underlying volcanics, being deformed into a series of broad, northwest trending open folds that plunge northwards. Three subparallel northwest striking lineaments are also recognized and coincide with the Ideal, Holly and Marble Bay faults. These faults cut a set of northeast striking faults. The Marble Bay fault, and to a lesser extent the Ideal fault, have apparently controlled the emplacement of some of the Jurassic intrusions and their associated skarn mineralization.

The Marble Bay occurrence area is near the Marble Bay fault and underlain by massive recrystallized limestone of the Quatsino Formation intruded by hornblende diorite stocks and numerous hornblende porphyritic diorite dykes. The limestones are brecciated in places and crossed by a number of fractures with variable strikes. Mineralized skarn often forms irregular pipe-like bodies that plunge moderately, subparallel to the contacts between limestone and intrusive rocks.

The Marble Bay orebodies contain predominantly chalcopyrite, bornite and native silver within extensive, steeply dipping, skarn- altered fracture zones that cut brecciated limestone. The skarn mineralogy is dominated by garnet, diopside, tremolite and calcite; considerable amounts of epidote occurs locally with garnet and diopside. Minor amounts of molybdenite occur throughout the mine. Rare tetrahedrite and native gold have also been reported. Pyrite and pyrrhotite occur in the intrusive rocks in small quantities.

The sulphide and silver mineralization tends to be concentrated along one margin of the fracture zones at the contact between skarn and marble or skarn and unaltered limestone; the other margin is commonly occupied by barren garnet-diopside-epidote-tremolite-calcite skarn. The orebodies pitch to the northwest at an angle of approximately 17 degrees and, although extremely irregular and disjointed, the host garnet-diopside-tremolite skarn is practically continuous from surface down to the 13th mine level, 353 metres below the surface.

The Marble Bay mine has been developed by extensive underground workings and production from 1899 to 1929 totalled 285,028 tonnes of ore yielding 6,789,882 kilograms of copper, 1,555,180 grams of gold, and 12,621,753 grams of silver.

The property is held by Consolidated Van Anda Gold Ltd.

EMPR AR 1898-1137,1144; 1899-607,804; 1900-926; *1901-1102,1105-1111; 1902-H23,H235; 1903-H204; 1904-G246; 1905-J25,J214; 1906-H26,H202; 1907-L152,L163,L215; 1908-J146,J152-J154; 1909-K149; 1910-K166; 1911-K195,K212; 1912-K197; 1913-K287,K288; 1914-K378-K380; 1915- K368; 1916-K351-K353; 1917-F258; 1918-K275-K277,K306; 1919-N219, N220; 1920-N215,N216; 1921-G222; 1922-N235; 1925-A284; 1929-C393; 1945-A114; 1946-A177
EMPR BULL 101, pp. 57, 166
EMPR FIELDWORK *1989, pp. 257-265
EMPR GEM 1970-282
EMPR OF 1988-28; 1990-3; 1998-10
EMPR P 1989-3, pp. 51-53
EMPR PF (Underhill, J.T. (1945): Plan of 400 and 500 Foot Levels; Consolidated Van Anda Gold Ltd. Website (Apr. 1998): Texada Island Mines History, 3 p.)
EMR MP CORPFILE (Marble Bay Mine; Marble Bay Mining Co. Ltd.)
GSC EC GEOL 3, pp. 86-102
GSC MAP 1386A; 17-1968
GSC MEM *58, pp. 48-56
GSC OF 463
GSC P 68-50
GSC SUM RPT 1924 Part A, pp. 106-144
Ettlinger, A.D. (1990): A Geological Analysis of Gold Skarns and Precious Metal Enriched Iron and Copper Skarns in British Columbia; unpublished Ph.D. Thesis, Washington State University, 246 pages