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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  11-Aug-2020 by Karl A. Flower (KAF)

Summary Help Help

BCGS Map 104B086
Status Prospect NTS Map 104B15W
Latitude 056º 48' 59'' UTM 09 (NAD 83)
Longitude 130º 54' 51'' Northing 6298575
Easting 383150
Commodities Gold, Silver, Copper Deposit Types I02 : Intrusion-related Au pyrrhotite veins
L04 : Porphyry Cu +/- Mo +/- Au
I05 : Polymetallic veins Ag-Pb-Zn+/-Au
Tectonic Belt Intermontane Terrane Plutonic Rocks, Stikine
Capsule Geology

The Camp Zone of the McLymont Creek property (McLymont 3 claim) is underlain by Mississippian and Permian sediments and volcanics of the Stikine Assemblage. The Mississippian package structurally overlies Permian stratigraphy, separated by a northeast trending steeply dipping reverse or thrust fault. The Mississippian is a thin bedded clastic marine succession comprising coarse crinoidal limestone, siltstone, sandstone, turbidites, lesser chert, and polymictic conglomerate. Permian(?) stratigraphy consists of hornblende-plagioclase porphyritic maroon andesite breccia flows, maroon lahar, lapilli tuff, and associated volcanic sediments. Quartz rich granite pluton intrudes the stratified rocks and occurs as dykes along pervasive northeast trending faults. This granite is thought to be Middle Jurassic in age.

The strata are intruded by a diverse suite of intrusive rocks ranging from the Late Devonian Mclymont Plutonic Suite to Eocene intrusions of the Coast Plutonic Suite. Two lithologically distinct phases: the southern quartz porphyry phase (Unit QP) and the more northerly granite to quartz monzonite units occur in the Camp Stock.

The Camp Zone is in the central portion of the claim group and is exposed along the bank of McLymont Creek. Mineralization consists of steep dipping, northwest trending quartz-pyrite-chalcopyrite veins. A northwest trending shear zone that often defines the contact between sediments and a quartz porphyry is the main structural control for the zone. The shear zone sits within a broad pyrite plus silica alteration zone. Within the porphyry there are numerous discontinuous quartz veins that can have a variety of orientations. Gold values within the zone can be very high grade (over two ounces gold per ton) but tend to be very narrow and discontinuous. The shear zone can be traced for hundreds of meters, but correlating gold values between drill holes has proven to be difficult.

In the central part of the property are numerous quartz-pyrite veins in the quartz-rich granite. The walls of the veins are enriched by k-feldspar. These auriferous quartz-pyrite veins are cut by a series of en echelon ankerite vein swarms that are generally oriented northwest and northeast. They are essentially ubiquitous throughout the northern parts of the claim group and are considered as late replacement veins formed along fractures in both the country rock and intrusive granite. Selected pyrite samples from several of these veins have returned good values in gold. In 1982, a sample taken from an ankerite-barite vein in the main grid area which contained pyrite and traces of chalcopyrite with arsenopyrite assayed 0.2 gram per tonne gold (Assessment Report 10418).

The quartz-pyrite-chalcopyrite veins in granite have been localized along 120 to 140-degree trending fractures in dominantly quartz-rich intrusive rock. These veins are concentrated near the centre of the claims, in the Camp zone, and are lenticular sub- parallel swarms which are traceable over lengths of up to 500 metres. Mineralization in these veins comprises mainly quartz, pyrite, some chalcopyrite, minor sphalerite, galena and scattered free gold. Native gold occurs in drill core from veins located mainly on the McLymont 1 claim.

The geological setting appears to be porphyry-related and the mineralization appears to be young with pyrite, chalcopyrite and free gold superimposed on earlier sphalerite-galena mineralization.

In 1987, six 1.0 metre samples from Trench 1 averaged 3.5 grams per tonne gold. Another six 1.0 metre samples from Trench 2 averaged 2.4 grams per tonne gold (Assessment Report 16932). A 7.1 metre sample from drill hole 87-10 assayed 18.1 grams per tonne gold (Gulf International Minerals Ltd., McLymont Project, 1988 Information Circular). In 1982, several grab samples taken from quartz-pyrite-chalcopyrite pods in veins and shear zones within the main grid area gave good values in gold, silver and copper. One sample assayed 17.04 grams per tonne gold, 116.23 grams per tonne silver with 0.34 per cent copper and another assayed 12.45 grams per tonne gold, 23.0 grams per tonne silver and 0.79 per cent copper (Assessment Report 10418).

In 2013, electromagnetic (ZTEM) and aeromagnetic geophysical surveys by Romios Gold Resources defined priority geophysical targets in the area of the Camp/Black Bear-Gorge occurrences, including Magnetic targets M8, M8' and M9, Resistive target R8 and Conductive target Z1, along with its central north trending conductive lineament (Figure 20. Assessment Report 35016).

In summary (Assessment Report 30449): "(1) Thin (generally less than 35 centimetres but locally up to 1 metre or more) early quartz-pyrite-chalcopyrite veins trend 300 to 320 degrees dipping steeply to the north. They contain minor sphalerite, galena, and free gold. 2)The second vein sets are ubiquitous en echelon ferro-carbonate-quartz-pyrite veins striking northwest and northeast, containing sparse chalcopyrite and erratic gold values.... Mineralized veins occur where a north-dipping fault intersects the Camp porphyry intrusive. When the fault and intrusive do not coincide gold bearing mineralization does not occur. The Camp zone is disrupted by en echelon north south faults marked by the streams east and west of the Gulf International Minerals Ltd. camp. This segmented the Camp Zone veining into a series of discontinuous segments."


Exploration in the area dates to the early 1900’s when the Iskut Mining Company completed work on Johnny Mountain. During the early 1960’s, Newmont Mining Corp. of Canada Ltd. Explored the area northwest of Newmont Lake just north of the McLymont property.

In 1980 the Warrior claims were staked by Dupont Canada Explorations Ltd., which covered ground now within the McLymont property boundary. Exploration on the property consisted of mapping, geochemistry and geophysics.

In 1983 Dupont optioned the property to Skyline Explorations Ltd. and Placer Development Ltd. The focus of exploration was narrow, high grade, quartz-pyrite- chalcopyrite veins. The claims were allowed to lapse in 1986 at which time Gulf staked the McLymont claims.

Gulf completed numerous exploration programs on the property from 1986 until 1990. Work included soil geochemical surveys, Mag and VLF surveys, mapping, trenching, road building and diamond drilling. To date approximately 60,000 feet of drilling has been completed on the property. The bulk of the drilling was used to delineate mineralization within the Northwest Zone (104B 281).

As a result of the work completed by Gulf two mineralized zones were evaluated. The Camp Zone, within the area first explored by Skyline and Placer, was the first zone drilled by Gulf. Mineralization consisted of gold in quartz-pyrite veins. The veins can be very high grade but tend to be narrow and discontinuous. Property wide exploration in 1987 led to the discovery of the Northwest Zone. Mineralization within the Northwest Zone consists of vein-like and replacement bodies of pyrite and magnetite with gold. Previous workers have suggested the zone may represent a gold rich retrograde skarn deposit.

In addition to the two main exploration targets two other zones, the Black Bear / Gorge Zone and the Valentine Zone, were identified but remained early stage targets.

During the summer of 2000, Pamicon Developments Ltd., on behalf of Gulf Minerals, conducted a small exploration program on the McLymont property. Fieldwork focused on the lesser explored Black Bear/Gorge Zone. 43 soil samples were collected.

In 2004, McLymont Mines conducted an airborne magnetic survey totalling 580 kilometres on the Mclymont 3-4 and MCX 1-9 claims near the McLymont occurrence (Assessment Report 27538).

In 2013 Geotech Ltd. carried out a helicopter-borne electromagnetic (ZTEM) and aeromagnetic geophysical survey for Romios Gold Resources Inc over the Newmont Lake Block, comprising parts of the Newmont Lake property (Geophysics Report, Assessment Report 35016, Appendix VI). The following 21 mineral occurrences were covered by the survey: Ken (104B 027), 72 (Dirk) (104B (114), Camp (104B 126), Northwest (McLymont), (104B 281), Jazzman (104B 282), Ridge (104B 325), Gab Northwest (104B 333), GAB 12 (104B 335), GAB 11 (104B 336), NEW (104B 379), Telena (104B 428), Bren (104B 429), Arseno (104B 432), Mon 2 (104B 433), Glacier Zone (104B 438), Camp Ridge (104B 441), Kirby NE (104B 442), Black Bear (104B 459), 2Bad (104B 460), Bridget (104B 462), O'Neil (104B 463).

More than eighteen discrete magnetic anomalies (M1-M11) have been defined by the magnetic survey and more than half (9) are reported to be unexplained geologically. The ZTEM surveys have defined both conductive and resistive signatures that relate to bedrock geology on the property, to depths extending to greater than 1 to 2 kilometres.

More than twelve prominent resistivity highs (R1-R9) were defined by the ZTEM survey. Most partially correlate with the more than eighteen magnetic anomalies and are interpreted to represent potential targets for porphyry-type magnetite-enriched potassic alteration. Fewer than six prominent resistivity lows (Z1-Z4) were defined and were reported to be for the most part longer, lineament-like conductive zones that lack magnetic signatures.

See Northwest (104B 281) for a more comprehensive discussion of the Newmont Lake property geology and work history. Also see Black Bear (104B 459) for related details.

EMPR AR 1961-8; 1962-9; 1963-134
EMPR ASS RPT 4150, 9224, *10418, *11319, *16932, *26384, 27583, 27996, *29085, *30449, 30749, *35016
EMPR EXPL 1980-470; *1983-529
EMPR GEM 1972-519
EMPR OF 1989-2
EMPR PF (Yeager, D.A. and Ikona, C.K. (1987): *Geological Report on the McLymont Claim Group, Feb. 1987 in Statement of Material Facts #70/87 for Gulf International Minerals Ltd., May 14, 1987; (1988): *Gulf International Minerals, McLymont Project, 1988 Information Circular; Gulf International Minerals Ltd. Progress Report #4, 1987)
GSC MAP 9-1957; 311A; 1418A
GSC P 89-1E, pp. 145-154
GCNL #110,#217, 1986; #110,#217, 1987; #45,#107,#151,#159,#181,#137, #138, 1988
NW PROSPECTOR Aug/Sept 1988 p.19
PR REL Gulf International Minerals Ltd., Nov.6, 1986; Jun.8,Jul.16, Sept.15,Oct.28, 1987; Aug.4,*Sept.19,Oct.4,5, 1988
V STOCKWATCH Jun.9,Oct.28,Dec.4, 1987
Anderson, R.G., (1988): A Paleozoic and Mesozoic Stratigraphic and Plutonic Framework for the Iskut Map area (104B), Northwestern British Columbia, pp. A1-A5, in Geology and Metallogeny of Northwestern British Columbia, Smithers Exploration Group, G.A.C. Cordilleran Section Workshop, October 16-19, 1988
Equity Preservation Corp. Stewart-Sulphurets-Iskut Compilation Dec. 1988 (Showing No. B5)
Boyd, T. (2019-02-04): Independent Technical Report - Newmont Lake Property