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File Created: 24-Jul-1985 by BC Geological Survey (BCGS)
Last Edit:  03-Mar-2014 by Nicole Barlow (NB)

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Name HED, ISINTOK Mining Division Osoyoos
BCGS Map 092H060
Status Developed Prospect NTS Map 092H09E
Latitude 049º 31' 04'' UTM 10 (NAD 83)
Longitude 120º 00' 49'' Northing 5489304
Easting 716144
Commodities Copper, Molybdenum, Silver Deposit Types L04 : Porphyry Cu +/- Mo +/- Au
Tectonic Belt Intermontane Terrane Plutonic Rocks
Capsule Geology

The Hed showing outcrops in the headwaters of Hedley Creek, 7.7 to 8.2 kilometres east of McNulty Creek and 18 to 19 kilometres north-northeast of the town of Hedley.

Regionally, the property is underlain by the multiphase Jurassic Okanagan Composite Batholith, which intrudes Upper Triassic Nicola Group lavas with intermixed argillaceous layers and lenses. Both units are overlain by Tertiary volcanics.

Locally, the property is underlain by the Red granodiorite phase of the Okanagan Batholith. This phase is lightly coloured and composed largely of quartz, plagioclase, pink orthoclase and/or microcline. The Red granodiorite is coarser than the adjacent Grey granodiorite, though it is also much more variable in texture and grain size. The Red granodiorite is associated with aplite and pegmatite dikes; pegmatitic phases also occur. An older, darker porphyritic phase is sometimes cut by the normal pink phase, but the two phases grade into one another and are so closely associated that mapping them as separating units is not possible.

The porphyritic phase contains euhedral orthoclase crystals up to 3 inches long and ranging in abundance from relative scarcity to greater than 75 per cent of the rock. Xenoliths with common orientation are present and are possibly related in abundance to orthoclase crystals. The groundmass, like much of the Grey granodiorite, is dark, foliated granodiorite.

The normal pink phase has a granodioritic average composition but ranges from granitic to quartz dioritic. Compared to the Grey granodiorite, this phase has a higher abundance of potash feldspar and quartz. Biotite is the most abundant ferromagnesian mineral, with tremolite-actinolite series amphibole also common. Accessory minerals include magnetite, apatite, titanite and zircon.

Hydrothermal alteration is both background and structure-controlled. Background alteration occurs as small, green-brown biotite aggregates replacing hornblende and corroding magmatic biotite. Patchy chloritization is seen in the southwest anomaly area. Structurally controlled alteration is closely associated with fractures, shear zones and quartz veining. Alteration of this type includes aplitic-textured quartz and potassium feldspar, with potassium feldspar flooding peripheral to younger quartz veins; dark green biotitization developed on fractures and shear planes; epidote veins; localized (supergene) clay alteration near open fractures; and widespread chloritization associated with intense shearing and fracturing.

Plagioclase on the property is largely fresh to weakly sericitized, except near areas of intense structurally controlled alteration, as described above. In these areas, weak pervasive light green alteration in plagioclase is seen as an indicator of proximity to sulphide mineralization.

Mineralization consists mostly of veinlets of chalcopyrite, chalcopyrite-bornite, chalcopyrite-bornite-molybdenite, molybdenite and rare pyrite-chalcopyrite veinlets. Chalcopyrite, pyrite and molybdenite also occur as rare disseminations in the granodiorite. Vein mineralogy and crosscutting relations suggest the following sequence of sulphide deposition: 1) chalcopyrite-molybdenite, 2) chalcopyrite, 3) chalcopyrite-bornite and 4) molybdenite.

Drilling in an area 1100 metres (north-south) by 550 metres (east-west) intersected discontinuous mineralized zones containing chalcopyrite, minor molybdenite and traces of bornite, chalcocite, malachite and azurite. One hole, drillhole 27, analyzed 0.24 per cent copper, 0.0013 per cent molybdenum, 1.1 grams per tonne silver and 0.053 gram per tonne gold over 9.15 metres (Assessment Report 9929, page 43; hole 27, 6.1 to 15.25 metres). A second hole, 840 metres south-southeast of drillhole 27, graded 0.18 per cent copper, 0.0014 per cent molybdenum and 0.73 gram per tonne silver over 9.15 metres (Assessment Report 9929, page 20; hole 13, 9.15 to 18.3 metres).

The showing was discovered and staked by Anaconda American Brass Ltd. in 1969 after anomalous molybdenum and copper values were obtained from a stream silt survey. Anaconda American Brass and Canex Aerial Exploration Ltd. conducted various geological, soil geochemical and geophysical surveys on the property between 1970 and 1972, drilling six percussion drill holes totalling 416 metres in 1972. Anaconda Canada Exploration Ltd. drilled an additional 18 percussion drill holes totalling 1464 metres in 1981.

In 1996, possible reserves were estimated at 22 994 985 tonnes grading 0.067 per cent molybdenum disulphide (0.04 per cent molybdenum) and 0.161 per cent copper or 0.386 per cent copper equivalency. The reserves were based on 14 widely spaced diamond and percussion drill holes drilled by Anaconda Canada Exploration Ltd. in 1981. The 14 holes averaged approximately 90 metres in depth, with many of the holes ending in ore-grade material. The area encompassed by the drilling measures approximately 1000 by 300 metres with a vertical mineralized interval of 27 metres (George Cross Newsletter No. 48 [March 7], 1996).

In 1992, Seguro Consulting Inc. conducted geological mapping, rock sampling and thin-section analysis on the property.

The property was held by Verdstone Gold Corp. and Amcorp Industries Inc. in 1996. Verdstone Gold conducted soil sampling (144 samples) and drilled three diamond drill holes totalling approximately 275 metres.

In 1997, Verdstone Gold Corp. and Molycor Gold Corp. drilled four diamond drill holes totalling 477.3 metres, in addition to conducting a tectonic survey and photogeophysical study reviewing Geological Survey of Canada geophysical maps to further define geophysical characteristics of the property.

Between 2005 and 2006, Jasper Mining Corporation conducted a diamond drill program that consisted of 20 drillholes totalling 5635.45 metres and that was designed to explore anomalies identified by an airborne geophysical survey including magnetic, resistivity and radiometric data flown earlier in 2005. In 2008, Jasper Mining drilled an additional 38 diamond drill holes totalling 9871.1 metres. Core from the 2005 to 2008 program was not logged or sampled until 2010, when TerraLogic Exploration was contracted to complete the program. Prior to this, Dynamic Exploration was managing exploration on the property.

Results from the core logging and sampling program are consistent with high-tonnage, low-grade copper-molybdenum-gold-silver porphyry systems, with several intervals returning 0.1 to 1 per cent copper and 0.2 to 1.9 per cent copper equivalency. Among the best results is drillhole IS08-18, with a 10.13-metre intercept of 2.1 per cent copper and 3.45 per cent copper equivalency (Assessment Report 33040).

EMPR GEM 1970-392,393; 1971-276; 1972-125
EMPR PF (Verdstone Gold Corporation Website (Mar.1999): HED, 1 p.)
GSC MAP 888A; 1386A; 41-1989
GSC P 85-1A, pp. 349-358; 91-2, pp. 87-107
CIM Special Volume 15, Map B (Occurrence 312) (1976)
GCNL #216, (Nov.9), 1995; *#48(Mar.7), 1996; #71(Apr.14), 1997