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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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Name PATTI, RANCH, AL (PATTI), NII FRACTION, HYUK 84, AL 4-7, HYUK 1-3 FRACTION Mining Division Liard, Omineca
BCGS Map 094E044
Status Prospect NTS Map 094E06W
Latitude 057º 26' 41'' UTM 09 (NAD 83)
Longitude 127º 21' 45'' Northing 6368076
Easting 598279
Commodities Gold Deposit Types H04 : Epithermal Au-Ag-Cu: high sulphidation
Tectonic Belt Intermontane Terrane Stikine
Capsule Geology

The Patti occurrence is located 5.2 kilometres southeast of the summit of Alberts Hump, south of Abesti Creek and 2.3 kilometres southeast of the AL (BV) (094E 099), 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 Patti prospect 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 AL 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. For a more detailed account of the local geology and alteration refer to the AL (Bonanza) occurrence (094E 079).

The Patti prospect comprises two closely spaced, parallel, north trending spines or hogback ridges of completely silicified rock, surrounded by a large halo of advanced argillic, argillic-silicic, and rare silicic-pyritic or quartz-alunite alteration zones. The hogback ridges coalesce on the south end of the zone, forming a massive silica outcrop approximately 60 metres wide. The overall dimensions of the alteration zone are at least 350 metres long and 250 metres wide.

Gold is apparently closely associated with massive barite in veins and breccias within the siliceous core. It appears that gold was deposited at the same time as barite, possibly during late-stage hydrothermal event. Explosive depressurization during this event may have caused fracturing and brecciation noted in the siliceous core with contemporaneous deposition of gold-barite mineralization.

In 1985, Energex Minerals carried out geological mapping and rock geochemical sampling in the Patti zone. A 15-centimetre chip sample (G-144) of a barite vein within a siliceous core assayed 3.75 grams per tonne gold. A grab sample (G-140) analyzed 58.8 grams per tonne gold (Assessment Report 14460).

In 1986, Lacana Mining Corp. tested the main silicified outcrop at the Patti zone with five diamond-drill holes, totalling 615.7 metres. A number of less than 0.5 to 6.0 metre long gold-mineralized intercepts were encountered in the four holes which tested the central part of the zone. The drillholes intersected some mineralization of interest, including 1.68 grams per tonne over 2.0 metres (Bowen, 2012).

In 2007, Christopher James Gold Corp. carried out a one-day mapping and rock geochemical sampling program in the Patti Zone. A total of 9 rock chip samples were collected. Six of the samples were collected from the area of silicified porphyritic andesite with samples assaying up to 1.1 grams per tonne gold and 12 grams per tonne silver; three samples collected from the area of massive silica yielded values ranging up to 13.6 grams per tonne gold and 2.3 grams per tonne silver (Assessment Report 30132).

During 2007, a helicopter-borne magnetic gradiometer survey consisting of 2229 line-kilometres was completed over all historic gold deposits and MINFILE occurrences on the Ranch property, including the Patti area. Maps completed include coloured Total Magnetic Intensity, Measured 3-D Analytic Signal, Measured Vertical Magnetic Gradient, and colour-shaded Tilt Derivative of the Total Magnetic Intensity.

See Bonanza (094E 079) for further geological and work history details of the Ranch (Al) property, which contains the Patti prospect along with a number of other prospects.

EMPR EXPL 1975-E163-E167; 1976-E175-E177; 1977-E216-E217; 1978-E244-E246; 1979-265-267; 1980-421-436; 1982-330-345; 1983-475-488; 1984-348-357; 1985-C349-C362; 1986-C388-C414; 1987-C328-C346; 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. 409-415; 1989, pp. 409-415; 1991, pp. 207-216
EMPR GEM 1969-103; 1971-63-71; 1972-483; 1973-456-463; 1980-427; 1982-15,336,337; 1983-xx,485; 1984-353,354; 1985-A20,A21,C355; 1986-A12,A44,A45,C403,C404,C407,C408; 1987-A44,C337
EMPR GEOLOGY 1977-1981, pp. 156-161
EMPR MAP 61 (1985)
EMPR PF (Photogeologic Interpretation Map of the Northern Omineca area, Oct. 1964, Canadian Superior Exploration Limited-in 94E General File)
EMPR PFD 831016
GSC OF 306; 483
GSC P 76-1A, pp. 87-90; 80-1A, pp. 27-32; 80-1B, pp. 207-211
ECON GEOL Vol. 86, pp. 529-554, 1991
GCNL #236, 1981; #243, 1983; #217,#145,#147,#163,#123, 1984; #166, #158,#154,#144,#141,#137,#128,#23, 1985; #211,#217,#148,#206, #162,#125,#35,#54,#22,#165, 1986; #86,#19,#80, 1987; #135,#180, #175,#165, 1988
IPDM Nov/Dec 1983
MIN REV September/October, 1982; July/August, 1986
NAGMIN Nov.8, 1985
N MINER Dec.24, 1981; July 26, 1984; Feb.21, June 27, July 25, Aug.1, Sept.9, 1985; May 12, June 16, July 28, Aug.4, Sept.15, Oct.6,13, Nov.10, 1986; Feb.2,9, 1987; June 13, 1988
N MINER MAG March 1987; March 1988, p. 1
V STOCKWATCH Jul.28, Aug.12,26,29, 1987
WIN Vol.1, #7, June 1987
W MINER April, 1982
*Bowen, B.K. (2012): Technical Report on the Ranch Project, for Guardsmen Resources Inc., May 18, 2012
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
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
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