Projects

Overview About El Salvador El Dorado, El Salvador Santa Rita, El Salvador Zamora/Cerro Colorado, El Salvador Project Generation and Acquisition Technical Reports Photo Album National Instrument 43-101 Information

National Instrument 43-101 Information

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 .

Mr. William Gehlen, Vice President Exploration, supervises Pacific Rim's exploration work on the El Dorado project. Mr. Gehlen is a Certified Professional Geologist with the AIPG (No. 10626), an employee of the Company and a Qualified Person as defined in NI 43-101.

Mr. David Ernst, Chief Geologist, supervises the Company's project generation initiatives. Mr. Ernst is geologist licensed by the State of Washington, an employee of Pacific Rim Mining Corp. and a Qualified Person as defined in National Instrument 43-101.

Pacific Rim's sampling procedures follow the Exploration Best Practices Guidelines outlined by the Mining Standards Task Force and adopted by The Toronto Stock Exchange. Samples are assayed using fire assay with a gravimetric finish on a 30-gram split. Quality control measures, including check- and sample standard-assaying, are being implemented. Samples are assayed by Inspectorate America Corporation in Reno, Nevada USA, an ISO 9002 certified laboratory, independent of Pacific Rim Mining Corp.

The January 2008 El Dorado resource estimate was prepared by Mr. Steven Ristorcelli, P.Geo., of Mine Development Associates, Reno, Nevada and conforms to current CIM Standards on Mineral Resources and Reserves. Mr. Ristorcelli is an independent Qualified Person as defined in NI 43-101. Mr. Ristorcelli and others at Mine Development Associates have verified the data used to tabulate these resources by auditing the Company's drill results database, reviewing drill sections, and examining drill core. A technical report in support of the January 2008 El Dorado resource estimate was filed with SEDAR on March 3, 2008. The report was co-authored by Mr. Steven Ristorcelli, P.Geo., and Mr. Peter Ronning, P.Eng., each of whom are independent Qualified Persons as defined in NI 43-101.

The July 2006 El Dorado resource estimate was prepared by Mr. Steven Ristorcelli, P.Geo., of Mine Development 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 was filed with SEDAR in July 2006. The report was co-authored by Mr. Steven Ristorcelli, P.Geo., and Mr. Peter Ronning, P.Eng., each of whom are independent Qualified Persons as defined in NI 43-101.

A pre-feasibility study for the El Dorado project was completed in January 2005. This pre-feasibility study is supported by a technical report prepared for the Company 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 (www.sedar.com). The primary author of the report is Mr. William F. Tanaka, a Qualified Person independent of the Company, as defined in NI 43-101. Mr. Tanaka is a member of the SME and the mAUSIMM.

The terms "measured resource", "indicated resource" and "inferred resource" used in this document 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.