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National Instrument 43-101
National Instrument 43-101 Standards of Disclosure for Mineral Projects is a rule developed by the Canadian Securities Administrators and applicable throughout Canada, which establishes standards for all public disclosure an issuer makes of scientific and technical information concerning mineral projects. Pacific Rim Mining Corp. adheres to the NI 43-101 standards, which require disclosure of the following information .
William Gehlen supervises all of Pacific Rim Mining Corp.'s exploration work in El Salvador. Mr. Gehlen is a Certified Professional Geologist with the AIPG (No. 10626), an employee of Pacific Rim and a Qualified Person as defined in NI 43-101. Mr. Gehlen has verified that the drill results presented on this website and in the Company's news releases, quarterly and annual reports and in other disclosure made by Pacific Rim, have been accurately summarized from the official assay certificates provided to the Company. Pacific Rim's drill sampling procedures follow the Exploration Best Practices Guidelines outlined by the Mining Standards Task Force and adopted by The Toronto Stock Exchange. This includes splitting the drill core, collecting one half for assay and retaining the other half for future reference, uniquely labelling and bagging each sample, limiting access to drill core and samples, storing samples in a secure environment and promptly shipping samples to a North American laboratory. Samples are assayed using fire assay with a gravimetric finish on a 30-gram split. Quality control measures are being implemented. Samples are assayed by Inspectorate America Corporation in Reno, Nevada USA, an ISO 9002 certified laboratory that is independent of Pacific Rim Mining Corp.
The 2006 El Dorado resource estimate was prepared by Mr. Steve Ristorcelli, P.Geo. of Mine Develoment Associates, Reno, Nevada. Mr. Ristorcelli is an independent Qualified Person as defined in NI 43-101. The resource estimate conforms to current CIM Standards on Mineral Resources and Reserves. A technical report in support of the updated El Dorado resource estimate presented above will be filed with SEDAR on or before July 31, 2006. The report will be co-authored by Mr. Steve Ristorcelli, P.Geo. and Mr. Peter Ronning, P.Eng., both independent Qualified Persons as defined in NI 43-101.
The El Dorado pre-feasibility study, including the Minita deposit reserve estimate, is supported by a technical report prepared for Pacific Rim Mining Corp. by SRK Consulting (US) Inc. of Denver Colorado, entitled "Pre-Feasibility Study, El Dorado Project, El Salvador", dated January 21, 2005 and publicly available on SEDAR. The primary author of the report is Mr. William F. Tanaka, a Qualified Person independent of Pacific Rim, as defined in National Instrument 43-101. Mr. Tanaka is a member of the Society of Mining Engineers (SME) and the Australasian Institute of Mining and Metallurgy (mAUSIMM).
The terms "measured resource", "indicated resource" and "inferred resource" used in this release are Canadian mining terms as defined in NI 43-101 and CIM Standards on Mineral Resources and Mineral Reserves. Mineral resources that are not mineral reserves have not been demonstrated to be economically and legally extractable. Mineral resource estimates do not account for mineability, selectivity, mining loss and dilution. It should not be assumed that all or any part of a resource will ever be converted to a reserve. These mineral resource estimates include inferred mineral resources that are normally considered too speculative geologically to have economic considerations applied to them that would enable them to be categorized as mineral reserves. There is also no certainty that these inferred resources will be converted to measured and indicated resource categories through further drilling, or into mineral reserves once economic considerations are applied.
The term "bankable" in reference to a feasibility study is defined as a comprehensive analysis of a project's economics and is used by the banking industry for financing purposes.
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