LONGUEUIL, QUEBEC -- (Marketwire) -- 01/09/13 -- Highland Copper Company Inc. (TSX VENTURE: HI) ("Highland" or the "Company") is pleased to announce results for 52 additional diamond drill holes from the 543S chalcocite deposit at the Keweenaw copper project in the Upper Peninsula of Michigan, U.S.A. Some of the higher-grade intersections in holes for which all assays have been received and checked include the following:
-- CEN397: 14.4 meters of 4.78% Cu and 1.3 g/t Ag including -- 7.6 meters of 8.15% Cu and 0.8 g/t Ag including -- 4.1 meters of 11.50% Cu and 0.9 g/t Ag-- CEN452: 22.7 meters of 3.80% Cu and 11.8 g/t Ag including -- 9.2 meters of 5.64% Cu and 25.7 g/t Ag, and -- 1.8 meters of 8.41% Cu and 2.7 g/t Ag-- CEN340: 18.0 meters of 3.20% Cu and 15.3 g/t Ag including -- 2.5 meters of 11.15% Cu and 50.8 g/t Ag-- CEN410: 8.2 meters of 3.32% Cu and 2.1 g/t Ag-- CEN376: 5.6 meters of 8.36% Cu and 20.7 g/t Ag
Sampling of visually-identified high grade copper intersections is on approximate 0.5 meter intervals adjusted for the geology. Individual high grade samples tend to cluster in continuous zones within broader envelopes of lower grade material. Contacts with adjacent unmineralized wall rocks may be sharp or gradational.
Considerable lengths of lower grade mineralization continue to be intersected, with several examples below:
-- CEN377: 49.5 meters of 1.14% Cu and 2.6 g/t Ag-- CEN368: 45.4 meters of 0.93% Cu and 2.3 g/t Ag including -- 2.3 meters of 4.95% Cu and 8.6 g/t Ag and -- 1.5 meters of 2.81% Cu and 1.4 g/t Ag-- CEN323: 44.0 meters of 0.75% Cu and 1.5 g/t Ag including -- 5.0 meters of 3.57% Cu and 4.0 g/t Ag-- CEN418: 36.7 meters of 1.32% Cu and 5.4 g/t Ag including -- 6.2 meters of 5.89% Cu and 4.8 g/t Ag
Lower grade copper intersections are hosted in basalt lava flow top breccias, but also occur along the contacts of or within dacite sills that occasionally cut across the lavas at low angles. Mineralization containing less than 0.75% Cu was not included in the historic resource estimate of the 543S deposit, although these lower grade intersections could provide additional upside for the deposit at current copper prices. Increased silver grades often accompany increased copper grades, but this relationship is not consistent. Assay composites results for the 52 holes reported here are summarized in Table 1 (click here for a link to Table 1: http://media3.marketwire.com/docs/AssayTable.pdf).
"The internal continuity of high grade copper intersections in individual drill holes and the unusual length of the lower grade intersections continue to be impressive," said Dr. Ross R. Grunwald, PhD, Vice president - Exploration for Highland. "With the drilling by Highland and previous exploration groups, the drill hole spacing on the 543S deposit is now 30 meters or less, thought sufficient to initiate a database audit leading to a resource estimate. Eight holes remain to be completed in the eastern portion of 543S and drills will then be moved to the G-2 prospect, 11 miles east. Work will continue through the winter with two machines."