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File Created: 24-Jul-85 by BC Geological Survey (BCGS)
Last Edit:  22-May-14 by Nicole Barlow(NB)

Summary Help Help

NMI
Name ALLEGRO Mining Division Osoyoos
BCGS Map 082E031
Status Showing NTS Map 082E05W
Latitude 49º 18' 52" N UTM 11 (NAD 83)
Longitude 119º 55' 25" W Northing 5466524
Easting 287523
Commodities Gold, Silver, Molybdenum, Tungsten Deposit Types L05 : Porphyry Mo (Low F- type)
L02 : Porphyry-related Au
K07 : Mo skarn
Tectonic Belt Intermontane Terrane Okanagan, Plutonic Rocks
Capsule Geology

The Allegro showing is situated approximately 500 metres west of the Star of Hope prospect (MINFILE 082ESW051) at the headwaters of Bradshaw Creek, 9 kilometres northwest of Olalla, British Columbia.

The regional geology of the area consists of a series of Carboniferous to Triassic volcanic and sedimentary rocks that have been intruded by granitic Okanagan intrusions. Larger intrusions are composed of granite and granodiorite, whereas smaller stocks are composed of diorite and gabbro. Numerous sills, dikes and apophyses are associated. Carboniferous to Triassic rocks are assigned to the Shoemaker and Old Tom formations. These rocks form the eastern limb of a large anticlinal fold with fold axes striking roughly north. The Shoemaker consists of cherts, greenstone and minor argillite. The Shoemaker Formation cherts are commonly lighter coloured (buff, pink, grey, grey-green) and show a saccharoidal texture. The overlying Upper Triassic Independence Formation consists of interbedded, dark grey to black chert (commonly rusty or red-stained), chert breccia and siliceous greenstone containing disseminated pyrite and pyrrhotite or pyrite and arsenopyrite.

At the Allegro showing, biotite hornfels, quartzites, metachert and minor skarn of the Independence and Shoemaker formations is intruded by fine to medium-grained hornblende diorite and medium to coarse-grained biotite hornblende granodiorite of the Okanagan intrusions. Minor aplite, granite and quartz-feldspar porphyry dikes locally intrude metasediments.

Several types of mineralization occur at the Allegro showing. A 1-metre-wide zone of silicification and pyritized hornfels is exposed in an old caved-in adit. The alteration is in contact with a quartz-feldspar porphyry dike. A 1-metre chip sample across this zone yielded 1.06 grams per tonne gold and 12.68 grams per tonne silver (Assessment Report 8145). Several small lenses of garnet-quartz-albite skarn (?) occur within biotite hornfels.

Molybdenite and powellite were observed in a prominently veined fracture set, striking 270 degrees and dipping 27 to 33 degrees north. The veining distribution is erratic, with some areas consisting of crosscutting or parallel veins. Vein density varies from tens of centimetres to several metres apart, with vein thickness varying from a millimetre to several centimetres. A rock sample of this material yielded only 0.05 per cent molybdenum, 0.02 per cent tungsten and 0.01 gram per tonne gold (Assessment Report 8145).

The Allegro claims were staked in 1979 by Newmont Exploration of Canada Ltd. to cover the ground lying between and surrounding the Yuniman (MINFILE 082ESW180) occurrence to the west and the Star of Hope (MINFILE 082ESW051) occurrence to the east. During property exploration, an old adit was discovered in silicified and pyritized hornfels. The adit probably dates back to the turn of the century.

The present Bradshaw Hill property was expanded by C. Greig, partner to B. Kreft, in January 2004, just prior to the finalization of an option agreement with Firestone Ventures Inc. In the same year, a work program carried out by Firestone Ventures Inc. consisted of five days of helicopter-supported detailed geological mapping, rock geochemical and limited silt and soil geochemical sampling. The program focused on due diligence–style sampling of the Main zone (MINFILE 082ESE180) and “ground truthing” of geochemical anomalies to the east and west.

In 2005, Target Exploration and Mining Company optioned the property. Target undertook geological, geochemical and geophysical work between 2006 and 2008. In 2007, Target completed a total field magnetics and induced polarization survey, approximately 3.5 by 0.8 kilometre in size, following the east-northeast trend of mineral showings on the property. Sampling resulted in zones of anomalous metal values in soil coincident with chargeability and resistivity anomalies.

Soil sampling between 2007 and 2012 has outlined multi-element geochemical anomalies near known mineralization.

Bibliography
EMPR ASS RPT 7429, *8145, 14059, 14530, 14580, 14651, 15222, 15843, 27746, 33729
EMPR OF 1989-5
GSC MAP 341A; 538A; 539A; 541A; 628A; 15-1961; 1736A; 2389
GSC MEM 38; 179
GSC OF 481; 637; 1505A; 1565; 1969
GSC P 72-53

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