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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  14-Apr-15 by Garry J. Payie(GJP)

Summary Help Help

NMI 093L9 Ag2, Cu1
BCGS Map 093L059
Status Past Producer NTS Map 093L09W
Latitude 54º 35' 47" N UTM 09 (NAD 83)
Longitude 126º 15' 48" W Northing 6053322
Easting 676791
Commodities Silver, Lead, Zinc, Gold, Copper Deposit Types I05 : Polymetallic veins Ag-Pb-Zn+/-Au
H05 : Epithermal Au-Ag: low sulphidation
G04 : Besshi massive sulphide Cu-Zn
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Topley Richfield property is underlain by Lower-Middle Jurassic Saddle Hill Formation rocks (Hazelton Group) in the eastern part of the Skeena Arch. Overburden in the area can be in excess of 50 metres thick. Mineralization is hosted primarily in pyroclastic rocks comprised of feldspar crystal tuff with lesser lithic tuffs, greywackes and thin beds of argillite. Pyroxene-bearing andesitic flows of the Early Jurassic Nilkitkwa Formation (Hazelton Group are located on the western portion of the property

Mineralization is structurally controlled and occurs in two alteration zones which strike north-northwest (350 degrees) and dip 45 degrees to the southwest. The zones range from 10 to 40 metres in width and are about 25 metres apart. They are characterized by pervasive silicification, brecciation, sideritic alteration and quartz and calcite veining. Bladed ankerite occurs commonly in calcite vugs. Pyrite is the most abundant sulphide with minor native gold, native silver, tetrahedrite, arsenopyrite, galena, sphalerite and chalcopyrite occurring as stringers, disseminations and blebs.

Lenses containing stronger sulphide mineralization occur within the alteration zones and are called the B/C and D zones. These lenses vary in width from 1 to 5 metres apart and rake to the southwest. The mineralization occurs in several narrow bands separated by unmineralized zones and makes up about 10 to 15 per cent of the lenses. Two intersections in the B/C lens in 1980 assayed 5486 grams per tonne silver over 20 centimetres, and 4.8 grams per tonne gold with 202 grams per tonne silver over 7.6 metres respectively (Assessment Report 9294).

Faulting in the area has offset the main workings and displaced the main alteration zones by about 100 metres along a right-lateral fault.

Significant development from 2 levels occurred from 1927 to 1929 with significant recent evaluation occurring from 1979 to 1987.

Drill indicated reserves at Topley Richfield are 181,420 tonnes grading 4.25 grams per tonne gold and 191.96 grams per tonne silver (Canadian Mines Handbook 1989-90, page 327).

The Topley-Richfield Property was discovered in 1926 and subsequently owned by the companies listed in Table 4-1. The Property contains a precious and base metal mineral prospect with underground workings on two levels that were constructed in 1927. Some 1500 metres of adits and inclined shafts were excavated. However, the underground workings were not accessible as 2008

The Topley-Richfield Mining Company constructed 240 metres of underground workings on two levels. In 1937, a 1.5 metres wide shear zone in andesitic breccia located about 300 metres east of the underground workings, was discovered. Within this shear zone, a 0.6 metre wide well mineralized lenticular quartz vein was found. The activities of the Topley-Richfield Mining Company are summarized in the B.C. Ministry of Energy, Mines and Petroleum Resources’ Annual Reports 1924 (page 98), 1926 (page 138-143), 1927 (page 140-147), 1928 (page 173-174), 1929 (page 179-180) and 1937 (page 26-27).

In 1952, Topley Mining Syndicate conducted a program of mapping, rock sampling and trenching.

From 1955-1958, Silver Standard Mines conducted dewatering and underground sampling and drilled 291 metres on the surface.

In 1967, Seemar Mines Ltd. conducted ground magnetics/electromagnetic surveys and 1100 metres of surface drilling.

In 1975, Canadian Superior Exploration Ltd. conducted a program of mapping, silt sampling, IP surveying and the drilling of 405 metres in 4 diamond-drill holes.

From 1979 to 1981, Canadian Superior Exploration Ltd conducted various exploration programs. The first IP and resistivity survey at Topley-Richfield were conducted. (Assessment Report 5553). No IP anomalies were generated and this was attributed to either the small size of the sulphide bodies or to the possibility that sulphides were shielded by quartz. In 1979, Cobre Exploration Ltd. conducted a very low frequency electromagnetic (VLF-EM) and vector pulse electro-magnetometer (EM) survey at Topley-Richfield. The VLF-EM survey detected a north-south striking anomaly around the old mine workings interpreted to be the surface expression of the previously detected shear zone/fault. In addition, a southeast striking anomaly was interpreted to be a previously unknown fault. Smaller features were interpreted to be veinlets of “Topleyite”, the local term for highly altered rocks.

Following the geophysical surveys, Cobre initiated a drilling programme in 1980, and completed 28 diamond drill holes (Assessment Report 8525, 9294, 9563, 9875). Several holes were drilled to test the conductivity anomaly found by the geophysical surveys, however, this zone consists of highly sheared (and highly conductive) andesitic and ultrabasic (likely carbonate altered or chlortized andesitic rocks) rocks without any mineralization. Five holes (80-4 to 80-8) tested the extension of the mineralized zone of the underground workings (supposed to lie underneath the sheared, conductive unit.). One hole (80-4) intersected a mineralized horizon but the favourable beds appeared to pinch out towards the south. All other holes tested the extension of the mineralized zone intersected in hole 80-4 to the north, south and its down dip extension to the west. The mineralized horizon was intersected in 8 holes and it was concluded that the ore zone thins out towards the south but may thicken again toward the southwest. In the north, the favourable beds thicken, but they are only weakly mineralized. This drilling campaign resulted in the discovery of the “B/C” ore shoot which was determined to be 300 metres by 55 to 70 metres by 2.2 metres and open to depth. Because of the stratabound nature of the mineralization (sphalerite, galena, chalcopyrite, arsenopyrite) in mono-mineralic layers, Cobre concluded that the type of mineralization was of the “volcanogenic type” (i.e., volcanogenic massive sulphide or “VMS”).

In 1982, Cominco undertook geophysical surveys (ground magnetometer) and 1983 (Assessment Report 11454). Sulphide bodies were not identified as a result of the IP survey.

Esso Minerals Canada drilled the Property in 1987, completing 1018 m of reverse circulation drilling and found only minor alteration and mineralization north of the underground workings (MacLeod, 1988). Later, diamond drilling targeted possible extensions of the mineralization southwest of previously delineated ore zones and found that the upper mineralized horizon thins out in this direction and the lower horizon was less mineralized although it maintained its thickness of approximately 40 metres. The drilling north of the old shaft intersected a 0.5 metre thick mineralized horizon (Assessment Report 17374).

MacLeod (1988; Assessment Report 17374) reported reserves of 170,000 tonnes grading 3.9 grams per tonne gold and 177.3 grams per tonne silver. Although some reports indicate that the Property was never mined, the B.C. Ministry of Energy, Mines and Petroleum Resources MINFILE Production Detail Report reports that 43 tonnes of ore were mined between 1938 and 1953.

In 2006, the NXA Inc exploration programme primarily focused in the vicinity of the old underground workings. Ground geophysical surveys consisting of 15 kilometres of IP and ground magnetics were conducted. Soil sampling resulted in 232 samples being collected. Four rock samples were collected.

In 2007, NXA Inc conducted an exploration program that included including line cutting, soil sampling and prospecting. Soil sampling along the exploration grid resulted in 332 samples being collected. Eight rock samples were collected. The combined 2006 and 2007 geochemical soil surveys conducted on the Topley-Richfield property identified a suite of metals which are mobile in the soil and are indicative of bedrock mineralization at depth.

EMPR AR 1924-98; *1926-138-143; *1927-140-147; 1928-173; 1929-179; 1930-363; 1935-C39; 1937-C26; 1941-43; 1946-89; 1951-117; 1952-95; 1955-25; 1956-28
EMPR BULL 1 (1929), p. 26; 64
EMPR ENG INSP Fiche No. 61663, 61664
EMPR EXPL 1975-E140; 1979-228; 1980-343; 1981-64,142; 1983-443; *1987-B50-B53; 1988-C170
EMPR GEOL 1975-G65
EMPR MAP 64; 65 (1989); 69-1
EMPR OF 1992-1; 1998-10
EMPR PF (Whiting, F.B. (1980): Geological Report on the Richfield Property in Statement of Material Facts, Feb. 22, 1980; miscellaneous maps; Sirius Resource Corporation, Statement of Material Facts #117/88, p. 7)
EMPR PF Chevron (T.H. Carpenter (1978): Re: Topley Silver Claim)
EMPR PF Placer Dome (Unknown (unknown): Claim map of Lennac Lake - Redtop Creek Area; Various (1928): News clipping: Diamond Drilling at Topley; C.J. Hodgson (1974): Drill Logs for Lennac Lake; Unknown (unknown): Geology map of the Lennac Lake area; Unknown (unknown): Mylar overlay of Lennac Lake geology; Unknown (unknown): Claim map of Lennac Lake; Unknown (unknown): Photo of hand sample - Lennac Lake; Northern Miner (1980): News clipping: Strong anomaly on Cobre's Ritchfield claims; Cobre Exploration Ltd. (1981): Cobre Exploration Ltd., Developing the Richfield Gold-Silver Mine in central BC; F.B. Whiting (1981): The Richfield Gold-Silver-Lead-Zinc Property)
EMPR PF Rimfire (Whiting, F.B. (1979-12-01): Property Submission: The Richfield Property, Gold-Silver-Zinc; P.M. Kavanagh (1961): Re: Geological and Geophysical Reconnaissance Project - Houston Map Area)
EMR MIN BULL MR 198, p. 237; 223 B.C. 229
EMR MP CORPFILE (Porcupine Goldfields Development and Finance Company; Topley Richfield Mining Company, Limited; Seemor Mines Limited; Cobre Exploration Limited)
GSC MAP 671A; 971A; 1424A
GSC OF 351
GSC P 36-20, p. 154; 40-18, p. 13
GSC SUM RPT 1928 Part A, pp. 71-74
GCNL #11,#18,#98,#113,#200, 1980; #27,#32, 1981; #206, 1982
N MINER Feb.12,Aug.13, 1981