Exploration thus far at Ball Creek has focused on the Main Zone and comprised over 11,800 metres of diamond drilling, airborne electromagnetic (EM) and magnetics and ground geophysics including induced polarization (IP) and magnetics surveying. Drilling in the 1.2 kilometres by 2.0 kilometres Main zone by previous operators intersected:
- 231 metres grading 0.21% copper and 0.54 g/t gold in drill hole BC07-12
- including 45.72 metres grading 0.31% copper and 0.69 g/t gold
- 223 metres grading 0.21% copper and 0.28 g/t gold in drill hole BC06-03
- including 45 metres grading 0.35% copper and 0.52 g/t gold
- 139 metres grading 0.23% copper and 0.60 g/t gold in drill hole BC07-06
- 74 metres grading 0.27% copper and 0.51 g/t gold in drill hole BC12-54
The Main Zone remains open in several directions and at depth with numerous untested drill targets, including coincident chargeability, geochemical and magnetic anomalies.
The Main Zone is centred on the southern flank of a 500 metre wide, 1000 metre long, feldspar-hornblende-biotite porphyry complex that strikes northeast, dips vertically and intruded into Upper Triassic mafic volcanic and volcaniclastic rocks. The Main Zone lies in a structural block that is separated from the Cliff, Goat and ME Zones by a northwest-trending fault. The northeast control on the intrusive complex is also evident at the ME, Goat and Cliff Zones, which have been offset from the Main Zone by a northwest-trending fault.
The porphyry system has a complex alteration system centred by a potassic zone that comprises K-feldspar, biotite and magnetite in the porphyritic intrusions and the country rock. Re-interpretation of drilling has identified a northeast-trending core of strongly-altered intrusive breccias that appears to act as a control on the distribution of the potassic alteration and the strongest mineralization. This panel of breccia acts as a focus for albite-chlorite-epidote alteration and is overprinted by sulphide mineralization adjacent to strong potassic alteration. The potassic alteration is overprinted and flanked by sericite-chlorite and sericite-quartz-pyrite alteration. Importantly, the sericite-chlorite and sericite-quartz-pyrite alteration also exhibit a vertical zonation that is associated with significant gold mineralization that overlies deeper potassic alteration. This overprinting sericite-dominant alteration signature is also present in the Red Chris deposit. The outermost features of the mineralized system are propylitic alteration and hornfels development southeast and northwest of the trend of mineralization.
Most of the drilling to date has focused along the southeastern contact of the porphyritic intrusion; limited shallow drilling has been carried out along the northwestern contact (Target 1 on Main Zone maps). This northwestern contact is also paralleled by a chargeability anomaly and is also marked by anomalous gold, copper and molybdenum soil geochemistry (Target 2). Similarly, the southern flank of the main chargeability anomaly has not been tested by drilling; it is also coincident with significant copper, gold and molybdenum soil anomalies (Target 6). The northeast and southwest extensions of the Main Zone mineralization have been untested by drilling (Targets 3 and 5) and areas within the core of the Main Zone that have only been tested by shallow holes also merit drilling (Target 4). An incompletely-defined chargeability anomaly parallels the northern contact of a porphyry that extends northeast from the Cliff Zone (Target 8). This chargeability anomaly is associated with quartz-sericite-pyrite alteration that overprints previously unrecognized potassic alteration and gold, copper and molybdenum soil anomalies which suggest a higher level expression of potassic alteration and mineralization that may be present near surface. Combined deep chargeability and magnetic anomalies have also been untested by drilling (Target 7).
The Cliff (Target 9), Goat and ME Zones are porphyry copper-gold targets that, with the Main Zone, form a cluster of centres associated with northeast-trending porphyritic intrusions that have yet to be systematically explored. The Goat, Cliff and ME Zones are separated from the Main Zone by a significant high-angle northwest-striking fault and one of these zones may be a faulted offset of the Main Zone. Limited mapping and drilling has identified alteration assemblages very similar to those in the Main Zone, including widespread potassic alteration locally overprinted and surrounded by quartz-pyrite alteration, sericite-pyrite-carbonate alteration, propylitic alteration and hornfelsed and calc-silicate altered country rocks. The zones also host quartz-pyrite-chalcopyrite±molybdenite stockworks, skarns with anomalous copper and later carbonate veins with galena and sphalerite.
The project also includes the underexplored Mess porphyry prospect, located ten kilometres southeast of the Schaft Creek Deposit. At Mess Creek, copper-gold-molybdenum mineralization is associated with monzonites that intruded Stuhini Group andesites and comprises stockwork mineralization and alteration associated with fractures, faults and intrusive breccias. This includes a zone of quartz stockwork at the north end of the Mess Creek area that hosts significant copper, gold and molybdenum values and has yet to be followed up by soil sampling or geophysics. Historic drilling in the Mess Zone has been limited with only 7 of 22 holes in the zone exceeded 200 metres in length to a maximum of 276 metres, yet still returned encouraging copper-gold mineralization.
Epithermal gold-silver mineralization at Rojo Grande warrants further exploration. The Rojo Grande Prospect is an extension of alteration related to Barrick Gold's Hank Project with an advanced argillic mineral assemblage (quartz-alunite-dickite-barite) and anomalous epithermal pathfinder geochemistry in soils and rocks over a 500 by 900 metre area. Only limited mapping, soil and rock sampling and IP have been completed at Rojo Grande.
The Rainbow Zones comprises a number of epithermal gold-silver occurrences. Mineralization varies from carbonate-rich base-metal veins to sheeted quartz veins associated with a magnetite breccia. Drill hole RN11-01 intersected biotite alteration and quartz-sulphide-magnetite veining that returned 91 metres grading 0.05% copper and 0.76 g/t gold, including 42.9 metres of 0.06% copper and 0.99 g/t gold.
The Table Mountain area is underlain by the Willow Ridge Complex which has been correlated with the stratigraphy hosting the Eskay Creek Deposit and hosts finely laminated pyritic mudstones and basalt breccias with disseminated sulphides.
The content of this page has been reviewed by Stewart Harris, P.Geo., Vice President, Technical Services for the Company. Mr. Harris is a Qualified Person as defined under the terms of National Instrument 43-101.