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Table 2.  Comparison of Mineral Resource Category Definitions, c.1995
vs. 2010
| MineralResource | USGS Circular 831 | CIM (2010) |
| Category | (1980) | |
| Measured Mineral |Materials whose |That part of a mineral|
| Resource: |quality and quantity |resource for which |
| |have been determined,|quantity, grade or |
| |within a margin of |quality, densities, |
| |error of less than 20|shape, and physical |
| |percent, by |characteristics are so|
| |quantitative data, |well established that |
| |including |they can be estimated |
| |appropriate analyses,|with confidence |
| |from closely spaced |sufficient to allow |
| |and |the appropriate |
| |geologically |application of |
| |well-known sample |technical and economic|
| |sites. |parameters, to support|
| | |production planning |
| | |and evaluation of the |
| | |economic viability of |
| | |the deposit. The |
| | |estimate is based on |
| | |detailed and reliable |
| | |exploration, sampling |
| | |and testing |
| | |information gathered |
| | |through appropriate |
| | |techniques from |
| | |locations such as |
| | |outcrops, trenches, |
| | |pits, workings and |
| | |drill holes that are |
| | |spaced closely enough |
| | |to confirm both |
| | |geological and grade |
| | |continuity. |
| IndicatedMineral |Materials whose |That part of a mineral|
| Resource: |quality and quantity |resource for which |
| |have been estimated |quantity, grade or |
| |partly from analyses |quality, densities, |
| |and |shape and physical |
| |measurements and |characteristics can be|
| |partly from |estimated with a level|
| |reasonable geologic |of confidence |
| |inferences. |sufficient to allow |
| | |the appropriate |
| | |application of |
| | |technical and economic|
| | |parameters, to support|
| | |mine planning and |
| | |evaluation of the |
| | |economic viability of |
| | |the deposit. The |
| | |estimate is based on |
| | |detailed and reliable |
| | |exploration and |
| | |testing information |
| | |gathered through |
| | |appropriate techniques|
| | |from locations such as|
| | |outcrops, trenches, |
| | |pits, workings and |
| | |drill holes that are |
| | |spaced closely enough |
| | |for geological and |
| | |grade continuity to be|
| | |reasonably assumed. |
|InferredMineralResource:|Materials in |That part of a mineral|
| |identified but |resource for which |
| |unexplored deposits |quantity and grade or |
| |whose quality and |quality can be |
| |quantity have been |estimated on the basis|
| |estimated from |of geological evidence|
| |geologic projections.|and limited sampling |
| | |and reasonably |
| | |assumed, but not |
| | |verified, geological |
| | |and grade continuity. |
| | |The estimate is based |
| | |on limited information|
| | |and sampling gathered |
| | |through appropriate |
| | |techniques from |
| | |locations such as |
| | |outcrops, trenches, |
| | |pits, workings and |
| | |drill holes. |
Marudi Mountain 2012 Drilling Program
The 2012 drilling program was planned to assess the gold mineralization
found in historical drilling and support the establishment of a N.I.
43-101 compliant resource estimate, if applicable. It is not known at
this time how many drill holes or the number of metres of diamond
drilling that would be required to produce a N.I. 43-101 compliant
resource estimate for the Marudi Mountain property.
Guyana Frontier’s 2012 drilling program, consisting of 12 holes totaling
1,977.47 metres, concluded in April 2012 (see Guyana Frontier’s news
releases dated May 2, 2012 and May 24, 2012). Three holes were drilled
in the Mazoa Hill target area, and the remaining 9 holes were drilled
in the Marudi North target area, where Guyana Frontier had identified