Contents

Four new publications: Open File 2010-04, Open File 2010-05, Geofile 2010-06, Information Circular 2010-02

Reminder: Geological Fieldwork 2009 is now available online

Evidence of westward glacial dispersal along a till geochemical transect of the Copper Star Cu±Mo±Au occurrence, west-central British Columbia

T. Ferbey and V.M. Levson

Open File 2010-04

http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/OpenFiles/2010/Pages/2010-4.aspx

A 2.5 km east-west geochemical sampling transect over the Copper Star porphyry occurrence in an area of a known ice-flow reversal reveals evidence for dominantly westward (locally 290°) glacial dispersal. The highest Cu (686.1 ppm) and Mo (4.98 ppm) values in the till transect occur directly west of the occurrence and generally decrease westward. The second highest Cu value (194.78 ppm), however, occurs in till directly east of the occurrence suggesting that a component of eastward dispersal also occurred. These observations are consistent with the ice-flow model for the area that predicts both eastward and westward dispersal. Dispersal distance from the mineral occurrence to the highest Cu concentration in till is short, probably reflecting the shallow till depth (<1 m) at the occurrence. In addition, elevated Au and Ag at two sites at the east end of the transect suggests potential precious metal mineralization in that area.

Biogeochemical orientation survey data from NTS 93F/2 and 7 (Davidson-Blackwater): Outer bark of lodgepole pine

C. Dunn and V.M. Levson

Open File 2010-05

http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/OpenFiles/2010/Pages/2010-5.aspx

Results from the analyses of the outer bark of lodgepole pine collected at 51 sites in the Interior Plateau region of central British Columbia are presented. The biogeochemical samples were collected from the Tsacha Lake (NTS 93F/2) and Chedakuz Creek (NTS 93F/7) 1:50 000 scale map areas. The concentrations of 44 elements in the ash of the bark samples are presented. The mean concentrations of most elements, including lead, zinc, copper, silver, nickel, gold, arsenic and antimony, are higher than in a larger regional survey conducted just to the northwest. Likewise the maximum concentration of most elements, including gold, arsenic, silver, nickel and zinc, are higher than in the survey to the northwest. In particular, mean and maximum concentrations of gold (40ppb and 733 ppb, respectively) are an order of magnitude higher. The three highest concentrations of gold (733,408, 109 ppb) are clustered in one area southwest of Top Lake. Concentrations of the pathfinder element arsenic are also elevated at these sites (10-12 ppm; >75th percentile). The anomalously high gold concentrations, clustering of the three sites, and high associated arsenic concentrations, suggest that there is an undiscovered gold occurrence in this area. An additional area of interest, with the fourth highest gold occurrence in the study area (74 ppb), occurs in the Big Bend Creek area. Two nearby sites have elevated gold (18-25 ppb) and one of these shows more than 90th percentile arsenic (15 ppm) and antimony (2.6 ppm) No mineral occurrences have been recorded in this area or at a number of other identified locations with high metal concentrations.

Age of Cu-Au-Ag mineralization at Copper Mountain: Part of a ~200 Ma copper epoch in BC

M.G. Mihalynuk, J. Logan, R.M. Friedman, V. Preto

Geofile 2010-06

http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/GeoFiles/Pages/2010-6.aspx

A chain of alkali Cu-Au±Ag-Mo porphyry deposits and coeval instrusive and volcanic rocks extend the length of the Canadian Cordillera. They are the product of a prolific metallogenic event. Mineralization at Copper Mountain is part of this event; recognized by workers in the 1970’s as coeval with intrusions that host the mineralization along with nearly coeval volcanic rocks. However, by the mid 2000’s this nearly coeval relationship was challenged by time scale revisions, changes to isotopic decay constants, improvements in dating techniques and over-interpretation of earlier cooling ages. If the isotopic age data were taken at face value, the mineralization at Copper Mountain appeared to be nearly 10 million years younger than the host rocks. With a new era of deep porphyry exploration about to begin, it was imperative to know whether mineralization was related to a younger, perhaps hidden intrusion or if existing age data were misleading.

MapPlace and MTO shortcourse notes from the Mineral Exploration Roundup 2010

K. Hancock, P. Desjardins, S. Meredith-Jones, K. Samuelson and N. Kohli

Information Circular 2010-02

http://www.empr.gov.bc.ca/Mining/Geoscience/PublicationsCatalogue/InformationCirculars/Pages/IC2010-2.aspx

Information Circular 2010-2 includes Part I and Part II of the course notes from the MapPlace/MTO short course offeredat Mineral Exploration Roundup 2010on January 17, 2010. The short course was presented by the Ministry of Energy, Mines and Petroleum Resources and AME BC.

Part I of the notes includes an introduction to the MapPlace and a review of its layout and functions. There are exercises to help the user become familiar with the ARIS MapBuilder, buffers, Mapper Wrapper, MapPlace2Go, and the Image Analysis Tool (IAT). The final section of Part I includes an integrated MapPlace exercise incorporating aspects from several of the related databases, including MINFILE, ARIS, and Property File. Part II of the notes outlines the steps required to login and use the Mineral Titles Online application to manage and stake tenure in British Columbia, including staking claims, filing Exploration and Development Work or making a payment in lieu. There are several hands-onexercises for clarification. How toobtain a Tenure Overlap Report and Landowner Notification procedures is reviewed, as well as other general information regarding mineral titles in British Columbia.

Survey News

· Geological Fieldwork 2009 is now available on line, with articles highlighting recent work throughout the province.

· Mark your calendars! The 2nd annual BCGS Open House will be on November 10, 2010.

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    Most provincial geoscience data can be easily accessed over the internet in map format at:

    www.MapPlace.ca and through various thematic pages at www.empr.gov.bc.ca/Mining/Geoscience

    Printed BC Geological Survey geoscience publications are available from Crown Publications Inc.

    Tel: 250-387-6409 Fax: 250-387-1120

    Email: crown@pinc.com Website: www.crownpub.bc.ca/

    Questions or to update your contact info please contact Tania Demchuk:

    Email: Tania.Demchuk@gov.bc.ca Tel: 250-952-0417 Fax: 250-386-0221

    BC Geological Survey

    British Columbia Ministry of Energy, Mines and Petroleum Resources

    Mining and Minerals Division

    Release Notification 2010-04

    February 8, 2010