The 2013 Resource is based entirely on diamond drilling data. The database contained records for 178 diamond drillholes, with a total of 6,220 assay intervals. This includes a total of 581 samples encompassing 612m collected and assayed in 2012 from previously unsampled intervals of core from 65 holes drilled between 1989 and 2007. Of the total 6,220 assay intervals in the Deposit database, 2,833 were eventually captured within the wireframe models used to constrain the estimate. Top cuts were applied to the samples prior to compositing. Samples were composited to 1.5m downhole intervals across the zones subtended by the wireframe models. Remnant composites with a length of less than 0.75m were discarded from the database.
Wireframe models for each of the mineralized zones were constructed from geological interpretations on 50m cross sections. In constructing these models, a nominal $45/t NSR cut-off was used along with a minimum horizontal width of 2.0m to construct the wire-frames to constrain the resource. The $45/t cut-off was derived by RPA based on comparable projects in North America, taking into account provisions for milling, G&A, and direct mining costs (i.e. no development). Due to the dip of the zones, the 2.0m horizontal width resulted in a minimum true width of approximately 1.6m. All thicknesses quoted in this release are derived from the US$45/t cut-off. Density was estimated for each block using a linear regression formula derived from a scatter plot of Zn grades versus measured specific gravity.
The Mineral Resources were classified using the following criteria:
-- Indicated was applied in the core of the deposit, where the nominal drill hole spacing is 65m or less, and/or where the average distance to the nearest three drill holes is 45m or less.-- All other blocks, estimated to a maximum distance of 250m in the massive and semi-massive sulphide bodies, and 190m in the stockwork bodies have been classified as Inferred Mineral Resources, with the exception of some of the stockwork mineralization in the lowermost extremity of the deposit.
In RPA's opinion, the Mineral Resources are classified in a manner that is consistent with NI 43-101 regulations and guidelines. Mineral resources do not have demonstrated economic viability. The estimate of mineral resources may also be affected by other relevant factors or issues. There is no guarantee that the Deposit will be placed into production.
Quality Assurance and Quality Control
For drilling conducted by Foran and its consultants in 2011 and 2012, an independent QA/QC protocol, consisting of blanks, standards, and duplicates introduced into the sample stream at a nominal rate of one sample of each type per 20 samples was implemented. Duplicates consisted of both field (core) and preparatory (pulp) duplicates. Sample analysis was performed by TSL Laboratories Ltd. ("TLS") in Saskatoon, Saskatchewan. TLS is a CAN-P-1579, CAN-P-4E (ISO/IEC 17025:2005) accredited laboratory and independent of Foran. For a full description of the QA/QC program see the Foran news release dated June 15, 2011.
RPA reviewed the QA/QC reports from these programs and noted that there were no issues that arose which would affect confidence with the assay data. RPA considers the sampling method appropriate for the deposit type, adequate security measures were maintained, and samples should be representative of the mineralization.