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File Created: 31-Jul-1989 by George Owsiacki (GO)
Last Edit:  27-Mar-2022 by Nicole Barlow (NB)

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NMI 094E6 Au4
BCGS Map 094E044
Status Developed Prospect NTS Map 094E06W
Latitude 057º 27' 44'' UTM 09 (NAD 83)
Longitude 127º 23' 17'' Northing 6370000
Easting 596700
Commodities Gold, Silver, Lead, Copper Deposit Types H04 : Epithermal Au-Ag-Cu: high sulphidation
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The BV developed prospect is located 2.9 kilometres southeast of the summit of Alberts Hump, south of Abesti Creek and 2.3 kilometres southwest of the Bonanza occurrence (094E 079), approximately 300 kilometres north of Smithers. The occurrence lies within the Omineca-Cassiar Mountains in the west-central portion of the Toodoggone Gold Camp.

The BV occurrence is situated within a Mesozoic volcanic arc assemblage which lies along the eastern margin of the Intermontane Belt, a northwest-trending belt of Paleozoic to Tertiary sediments, volcanics and intrusions bounded to the east by the Omineca Belt and to the west and southwest by the Sustut and Bowser basins. Permian Asitka Group crystalline limestones are the oldest rocks exposed in the region. They are commonly in thrust contact with Upper Triassic Takla Group andesite flows and pyroclastic rocks. Takla volcanics have been intruded by the granodiorite to quartz monzonite Black Lake Suite of Early Jurassic age and are in turn unconformably overlain by or faulted against Lower Jurassic calcalkaline volcanics of the Toodoggone Formation (Hazelton Group).

The dominant structures in the area are steeply dipping faults which define a prominent regional northwest structural fabric trending 140 to 170 degrees. In turn, high angle, northeast-striking faults (approximately 060 degrees) appear to truncate and displace northwest-striking faults. Collectively these faults form a boundary for variably rotated and tilted blocks underlain by monoclinal strata.

The Adoogacho and Metsantan members of the Toodoggone Formation underlie the property. The Adoogacho Member consists of trachydacite ash-flow tuff with lenses of lapilli tuff, rare marlstone, and conglomerate near the base. The Metsantan Member is composed mainly of trachyandesite (latite) flows with lenses of lapilli tuff, and lahar; minor volcanic sandstone and conglomerate (Bulletin 86). The Metsantan Member, in part, directly overlies the basal Adoogacho Member and is also in fault contact with it.

The BV developed prospect has been exposed by drilling and trenching over about 600 metres along a northwest strike. The west limb of the zone trends west-northwest and is hinged to an eastern limb that trends northwest. The zone is up to 15 metres wide and appears to contain several sub-parallel gold-bearing lenses which strike west-northwest and dip to the north. The structure hosting the BV occurrence remains open at both ends. The average width of the mineralized surface exposure is roughly 10 metres, along a 170-metre-long section of exposed vein structure. Drilling indicates mineralization persists to at least 50 metres depth. On surface, the vein structure branches or is faulted into at least two semi-parallel mineralized zones within a repetitious barite-quartz sequence (Assessment Report 16057).

The BV occurrence is barite-hosted, but differs from the AL (Thesis III) (094E 091) and the Bonanza (094E 079) in that high-grade mineralization occurs as narrow, discrete barite-quartz-pyrite veins in a silicified andesite flow, with a more continuous strike length. The BV prospect does not display the lensoidal, advanced argillic alteration, acid-leaching features and porous silicified zones characteristic of an upper-level epithermal system, characteristic of other acid-sulphate associated deposits in the area. The mineralization and alteration are more confined and directed by the fault system hosting the occurrence. The veins are commonly brecciated and sheared at depth and are associated with strong sericitic alteration. The occurrence of minor galena and chalcopyrite, and less pyrite associated with gold mineralization, the higher-than-average silver content for the area and the presence of chalcedonic quartz veins, suggest deeper epithermal emplacement of the BV mineralization.

Geochronological studies (Fieldwork 1988, pages 409-412) using sericite from the alteration zone at the BV yielded an age of 152 +/- 5 Ma and is considered a minimum age of alteration and mineralization.

In the BV zone, past diamond drilling during the period 1984 to 1987 consisted of 2278.2 metres of HQ and NQ size core in 48 holes. The majority of the total meterage was completed by Energex from 1985 to 1987; it tested the BV zone over a northwest-southeast strike length of about 350 metres down to vertical depths of about 50-60 metres. Most of the drilling has taken place within a 180 metre-long segment which was the focus of past open-pit mining. There has been no post-Energex drilling completed in the BV zone by other operators to at least 2012.

Historically, it was estimated that the BV occurrence contained 53,000 tonnes grading 10.4 grams per tonne gold (Fieldwork 1988, page 410).

Currently, 45,355 tonnes of ore grading 13.3 grams per tonne gold has been mined and stockpiled.

In their October 2007 Technical Report, Micromine Consulting published a post-mining resource estimate of the BV zone. Using a 3.5 grams per tonne gold cut-off, Micromine estimated 33,870 tonnes grading 9.53 grams per tonne gold (Bowen, 2012, referencing Bilki et al. (2007)).

See Bonanza (094E 079) for geological and work history details of the Ranch (formerly Al) property, which presently contains the BV deposit, and several other prospects.

EMPR EXPL 1975-E163-E167; 1976-E175-E177; 1977-E216-E217; 1978-E244-E246; 1979-265-267; 1980-427; 1982-15,336,337; 1983-485; 1984-353,354; 1985-A20,A21,C355; 1986-A12,A44-A45, C403-404,C407-408; 1987-A44,C337; 1988-A16,C185-C194
EMPR FIELDWORK 1980, pp. 124-129; 1981, pp. 122-129, 135-141; 1982, pp. 125-127; 1983, pp. 137-138, 142-148; 1984, pp. 139-145, 291-293; 1985, pp. 167-169, 299; 1987, pp. 111, 114-115; 1988, pp. 409-412; 1989, pp. 409-415; 1990, pp. 207-216
EMPR GEM 1969-103; 1971-63-71; 1972-483; 1973-456-463
EMPR GEOLOGY 1977-1981, pp. 156-161
EMPR MAP *61 (1985); 65 (1989)
EMPR OF 1992-1
EMPR PF (CANSUP File, Reconnaissance Geochemical Survey map; (News Report, 12 p., Multinational Resources Inc.; Claims map of the Toodoggone Gold Camp, Duke Minerals Ltd.; Photogeologic Interpretation Map of the Northern Omineca area, Oct. 1964, Canadian Superior Exploration Limited-in 94E General File); News Release, 1986, Multinational Resources Inc.; Annual Report, 1986, Energex Minerals Ltd.; Annual Report, 1986/87, Energex Minerals Ltd.; News Release, (July 15;31) 1986, Energex Minerals Ltd.; 2nd Quarter Report, (Nov.30) 1987, Energex Minerals Ltd.)
GSC OF 306; 483
GSC P 76-1A, pp. 87-90; 80-1A, pp. 27-32
ECON GEOL Vol.86, pp. 529-554, 1991
GCNL #147(July 24); #163(Aug.23); #183(Sept.21); #192(Oct.4), 1984; #23,(Feb.1); #141(July 23); #154(Aug.12), 1985; #22(Jan.31); #149 (Aug.5); #165,(Aug.27); #206(Oct.27); #217(Nov.12), 1986; #19 (Jan.28), 1987; #180(Sept.18), 1991
IPDM Nov/Dec 1983
MIN REV September/October, 1982; July/August, 1986
NAGMIN Nov.8, 1985
N MINER Aug.23, 1984; May 12, June 16, Aug.4, Oct.6,13, 1986; Feb.2, 9, 1987
N MINER MAG March 1988, p. 1
V STOCKWATCH Jul.28, Aug.12,26,29, 1987
W MINER April, 1982
WIN Vol.1, #7, June 1987
Bilki, F. et al. (2007): QA/QC Analysis and Resource Estimation of the Ranch Gold Project, by Micromine Consulting Ltd. for Christopher James Gold Corp., October 2007.
*Bowen, B.K. (2012): Technical Report on the Ranch Project, for Guardsmen Resources Inc., May 18, 2012
Diakow, L.J. (1990): Volcanism and Evolution of the Early and Middle Jurassic Toodoggone Formation, Toodoggone Mining District, British Columbia, Ph.D. Thesis, University of Western Ontario
Forster, D.B. (1984): Geology, Petrology and Precious Metal Mineralization, Toodoggone River Area, North-Central British Columbia, Unpub. Ph.D. Thesis, University of British Columbia
Falconbridge File
Chinapintza Mining Corp. (2020-09-18): NI 43-101 Technical Report, Geological Introduction to Chinapintza Mining Corp.'s Ranch Gold Project, Toodoggone Region, British Columbia, Canada
Chinapintza Mining Corp. (2021-06-22): Amended Technical Report: NI 43-101 Technical Report, Geological Introduction to Chinapintza Mining Corp.’s Ranch Gold Project, Toodoggone Region, British Columbia, Canada