(Due to rounding the numbers in the above may not check exactly. This is an estimate of in situ resources only and there is no assurance that any part of these resources can be converted to reserves. Grades are given to 2 decimals and contained metal to the nearest 000 for comparative purposes and do not imply this degree of accuracy.)
Construction of Wireframes
Mineral Resources were estimated by Mr. Sandefur within wireframes constructed by technical personnel of Minop SA de CV ("Minop"), a subsidiary or affiliate of Goldgroup. Minop was contracted by Mineras de DynaResource SA de CV. ("Mineras"), a 100% owned subsidiary of DynaUSA and the exclusive operating entity at SJG under agreement with DynaMexico.
Parameters Used to Estimate the Mineral Resource
The data base for the San Jose de Gracia Project consists of 372 drill holes of which 361 were diamond drill holes and the remaining 11, drilled in 1992, were reverse circulation holes, with a total drilling of 75,878 meters. The 2012 DynaMexico-CAM SJG Mineral Resource Estimate concentrates on four main mineralized vein systems at SJG: Tres Amigos, San Pablo, La Union, and La Purisima. Of the 372 drill holes, 368 were drilled to test these four main vein systems and the remaining four holes tested the Argillic Zone. Technical personnel of Minop built three dimensional solids to constrain estimation to the interpreted veins in each swarm. The 172 holes most recently drilled (2009-2011), were allocated as follows: Tres Amigos (64 holes), San Pablo (49 holes), La Union (24 holes), La Purisima (32 holes) and the Argillic Zone (3 holes).
Servicios y Proyectos Mineros performed a database review and considers that a reasonable level of verification has been completed, and that no material issues have been left unidentified from the drilling programs undertaken.
A total of 5,540 pieces of core were measured for specific gravity using the weight in air vs. weight in water method. This represents an additional 3,897 measurements taken in the 2009-11 drill seasons with density measurements taken from all mineral zones. Dried samples were coated with paraffin wax before being measured. The results tabulated have been sorted by lithology and mineralized veins. The average specific gravity of 5,051 wall rock samples is 2.59 while the average specific gravity for 489 samples of vein material is 2.68. CAM and Servicios y Proyectos Mineros have reviewed the procedures and results, and opine that the results are suitable for use in mineral resource estimation.
Explanation of Resource Estimation
Resource estimation was done in MineSight and MicroModel computer systems with only those composites that were inside the wireframe used in the estimate. Estimation was done using kriging with the omni-directional variogram derived from all the data in each area for gold using the relative variogram derived from the log variogram. High grades were restricted by capping the assays at a breakpoint based on the cumulative frequency curves. Estimation was done using search radii of 100 x 100 x 50 m oriented subparallel to the general strike and dip of the vein system in each area. A sector search, corresponding to the faces of the search box with a maximum of two points per sector was used in estimation. A density of 2.68 based on within vein density samples was used in the resource estimate. Within each of the four areas there are approximately 20 to 40 veins in the vein swarm. Resources were estimated by kriging using data from all veins in the swarm. In general, gold accounts for at least 80% of the value of contained metal at the project, so the variograms for gold were used in estimation of the four other metals. Mineral Resources at Tres Amigos and San Pablo were classified as Indicated as follows:
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