COEUR D'ALENE, IDAHO -- (Marketwired) -- 05/23/13 -- Timberline Resources Corporation (NYSE MKT: TLR)(NYSE Amex: TLR)(TSX VENTURE: TBR) ("Timberline" or the "Company") today announced that it has completed an updated technical report on the Butte Highlands Property in Montana (the "Report") that will be filed on SEDAR later today.
The Report was prepared by the Company's independent geological consultant, Mine Development Associates (MDA), and provides an updated technical summary of the Butte Highlands project. The Report includes an updated description of the property and the regional geology, the permitting requirements and progress, and the exploration and development work that has been accomplished during the past few years. Metallurgical test work that has been performed is summarized, and additional metallurgical testing is recommended.
An historic mineral resource estimate is included in the Report, but a qualified person has not done sufficient work to classify any of the historic estimates as current mineral resources. Timberline is not treating these estimates as current mineral resources, and the historic estimates should not be relied upon. There is no current mineral resource or reserves estimate for the Butte Highlands project. The historic mineral resource estimates are described in the Report as follows:
The following historic resource estimates were made prior to initiation of NI 43-101 reporting requirements, and MDA cannot determine if they meet the Canadian Institute of Mining ("CIM") classification standards. A qualified person has not done sufficient work to classify these historic estimates as current mineral resources, and Timberline is not treating them as current mineral resources. These historic estimates are presented using original "resource" and "reserve" terminology. The terminology does not necessarily conform to current mineral resource and reserve classifications defined by the CIM.
Orvana (Roper, 1997) reported that Battle Mountain identified a structurally controlled "underground mineable resource" of about 200,000 ounces of gold at the Highlands mine in 1989, while Placer Dome discovered a sediment-hosted skarn "resource" of about 30,000 ounces amenable to open-pit mining at the Chief (Ballarat) mine area east of the Highlands mine in 1991 (the Ballarat mine is not part of Timberline's Butte Highlands project). Orvana's description did not include any information on the assumptions, parameters, or methods on which these estimates were based.
Orvana used their drill results and historic drilling data to estimate a "geologic resource" for the Nevin Hill deposit in June 1997, using manual cross-sectional methods (Roper, 1997). Twelve northwest-facing cross sections were constructed on 100-foot centers. Polygons were drawn on the sections to encompass drill-hole intercepts greater than 0.1 oz Au/ton over greater than or equal to 10 feet. The polygons were then projected section to section to achieve a volume. Grade was assigned based on weighted-average intercepts within the shapes, and a rock density of 12 ft3/ton was applied to the volumes. The resulting "resource" estimated by Orvana was 583,253 tons grading 0.335 oz Au/ton in the "Measured and Indicated" categories for a total of 195,208 ounces of gold; Orvana did not separate the two categories of "resources". They also calculated an "Inferred" category by projecting 500 feet along trend from the drill-hole intercepts, but MDA believes this is not appropriate for the Butte Highlands skarn mineralization and therefore these results are not reported herein. Orvana noted that the Nevin Hill mineralization remained open down dip and along strike (Roper, 1997).
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