Last updated on March 16, 2014 at 9:20 EDT

Guyana Frontier Provides Review of Marudi Mountain Historical Resource Estimate

June 6, 2012

VANCOUVER, June 6, 2012 /PRNewswire/ – Guyana Frontier Mining Corp. (TSX-V:
GYG) (“Guyana Frontier”) is pleased to announce that it has carried out
a review of a historical resource estimate for the Mazoa Hill deposit
at the Marudi Mountain Gold Project (“Marudi Mountain”) in southern
Guyana, South America. The historical resource estimate was first
published in 1995, prior to the implementation of National Instrument
43-101 (“N.I. 43-101″). Guyana Frontier engaged Reserva International
LLC, of Reno, Nevada to conduct the review.

About the Marudi Mountain Historical Resource Estimate

The Marudi Mountain property has been the subject of extensive
historical work, including approximately 28,000 metres of diamond
drilling. In June 1995, Kilborn Engineering Pacific Ltd. (“Kilborn”),
of Vancouver, B.C., Canada, prepared an evaluation report (the
“Evaluation Report”) of Marudi Mountain for Sutton Resources Ltd
(“Sutton”). The Evaluation Report included a resource estimate for the
Mazoa Hill target area, where approximately 13,530 metres were drilled
in 70 historical holes, based on drill core data, geological
descriptions, surface trenching channel samples, and adit channel
samples provided to Kilborn by Sutton. Metallurgical test data used for
the Evaluation Report were taken from 1982 and 1991-1993 work programs.

Geological resources as depicted in Table 1 at selected cut-off grades
of 0.50, 1.00 and 1.50 grams/tonne gold were classified by Kilborn as
“Measured & Indicated”, and “Inferred” categories based on the
“Principles of Resources/Reserve Classification for Minerals” contained
in Circular 831 published by the U.S. Bureau of Mines and the U.S.
Geological Survey (“USGS”). See Table 2 for a comparison between the
mineral resource category definitions described in USGS Circular 831,
and those definitions published by the Canadian Institute of Mining,
Metallurgy and Petroleum (“CIM”) in 2010, which were adopted under N.I.

Table1. Historical Geological Resources of the Mazoa Hill Deposit (from
“Evaluation Report of the Marudi Mountain Project”, by Kilborn, 1995)

    | Mineral |    Above    |  Volume |   Average   | Tonnage |   Metal Content  |
    | Resource|Cut-off Gold |   (m3)  |    Grade    | (metric |       (Gold)     |
    | Category|    Grade    |         |    Gold     | tonnes) |                  |
    |         |(grams/tonne)|         |(grams/tonne)|         |   (grams)        |
    |         |             |         |             |         |       (oz.)      |
    |Measured |      0.50   |1,584,187|      2.36   |4,594,143|10,842,177|348,589|
    |&        |             |         |             |         |          |       |
    |Indicated|             |         |             |         |          |       |
    |Inferred |      0.50   | 407,910 |      1.99   |1,182,940|2,354,051 |75,686 |
    |Measured |      1.00   |1,165,890|      2.94   |3,381,081|9,940,378 |319,595|
    |&        |             |         |             |         |          |       |
    |Indicated|             |         |             |         |          |       |
    |Inferred |      1.00   | 296,870 |      2.45   | 860,924 |2,109,264 |67,815 |
    |Measured |      1.50   | 906,425 |      3.42   |2,628,633|8,989,925 |289,037|
    |&        |             |         |             |         |          |       |
    |Indicated|             |         |             |         |          |       |
    |Inferred |      1.50   | 202,448 |      3.02   | 587,100 |1,773,042 |57,005 |

The resource estimate contained in the Evaluation Report is historical
in nature, and is not based on an existing technical report prepared
under the guidelines of N.I. 43-101. Guyana Frontier considers the
historical resource estimate to be relevant to ongoing exploration and
believes that it provides a conceptual indication of the potential of
the gold occurrence but does not consider it to be reliable at this
time. No more recent mineral resource estimate regarding the Mazoa Hill
deposit is available to Guyana Frontier. A Qualified Person, as defined
by the guidelines of N.I. 43-101, has not done sufficient work to
classify the historical estimate as current mineral resources or
mineral reserves, and Guyana Frontier is not treating the historical
estimate as current mineral resources or mineral reserves.

Reserva International LLC recommends that in conjunction with additional
drilling, the implementation of a comprehensive QA/QC program, standard
data verification procedures, and additional measurements of specific
gravity and core recovery would be required to validate the historical
resource estimate and align it more closely with current best practice
guidelines. Guyana Frontier has implemented industry standard QA/QC
procedures in its 2012 drilling program.

As Table 2 shows below, the implementation of the CIM mineral resource
category definitions presents a higher degree of detail than the
definitions used prior to the implementation of N.I. 43-101. For
example, the 1995 Kilborn mineral resource estimate provides a combined
measured and indicated resource, and does not separate or distinguish
between the two categories.

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
prospective drill targets from its extensive 2011 trenching program.
Guyana Frontier successfully encountered gold mineralization at Marudi
North within quartzite-metachert rocks (the host rock), interpreted as
similar in composition to the rocks known to host gold mineralization
at the Mazoa Hill target area, located approximately 1.6 kilometres to
the south. Results of 6 holes from Marudi North yet to be reported are
currently being compiled and interpreted.

For maps and photos depicting the 2012 drilling, please visit Guyana
Frontier’s website at www.guyanafrontier.com

The technical disclosure in this news release was reviewed and approved
by Mr. Tim Carew, P.Geo., of Reserva International LLC, a Qualified
Person as defined in N.I. 43-101 and an independent contractor to
Guyana Frontier.

About Marudi Mountain

Marudi Mountain consists of one Mining Licence totaling 13,502 acres
(5,464 hectares) located in southern Guyana approximately 500
kilometres (330 miles) from the capital city of Georgetown.

Guyana Frontier also holds the adjacent Paint Mountain property (“Paint
Mountain”). Paint Mountain consists of one Prospecting Licence totaling
8,848 acres (3,581 hectares) and remains largely underexplored. Guyana
Frontier recently commenced surface exploration at Paint Mountain,
including trenching, prospecting, and geological mapping. A portion of
the property has been selected for trenching, detailed mapping and
sampling on the basis of favourable geology and the presence of
artisanal alluvial gold miners. Airborne geophysical surveys are
planned for both the Paint Mountain and Marudi Mountain properties in

About Guyana Frontier

Guyana Frontier is a public mineral exploration company listed on the
discovery and development of precious metals deposits within Guyana,
South America. Guyana Frontier began acquiring interests in Guyanese
exploration properties in 2007, and now holds various rights to obtain
working interests in approximately 342,000 acres (138,400 hectares) of
prospective lands. Guyana Frontier’s goal is to develop a significant
gold resource at Marudi Mountain, and to explore its other Guyanese
projects using funding from exploration partners.

Neither the TSX Venture Exchange nor its Regulation Services Provider
accepts responsibility for the adequacy or accuracy of this release.


applicable Canadian securities legislation.  Forward-looking statements
events or developments that the Company expects or anticipates will or
may occur in the future, including such things as planned exploration
activities at the Marudi Mountain and Paint Mountain properties, the
establishment of an NI 43-101 compliant resource at the Marudi Mountain
property, future business strategy, competitive strengths, goals,
expansion, growth of the Company’s businesses, operations, plans and
with respect to exploration results, the timing and success of
exploration activities generally, permitting time lines, government
regulation of exploration and mining operations, environmental risks,
title disputes or claims, limitations on insurance coverage, timing and
possible outcome of any pending litigation and timing and results of
future resource estimates or future economic studies.


assumptions, including, the result of drilling and exploration
activities, that contracted parties provide goods and/or services on
the agreed timeframes, that equipment necessary for exploration is
available as scheduled and does not incur unforeseen break downs, that
no labour shortages or delays are incurred, that plant and equipment
function as specified, that no unusual geological or technical problems
occur, and that laboratory and other related services are available and
perform as contracted.  Forward-looking statements involve known and
unknown risks, future events, conditions, uncertainties and other
factors which may cause the actual results, performance or achievements
to be materially different from any future results, prediction,
projection, forecast, performance or achievements expressed or implied
the interpretation and actual results of current exploration
activities; changes in project parameters as plans continue to be
refined; the existence of weather conditions suitable for exploration
activities; future prices of minerals; possible variations in grade or
recovery rates; failure of equipment or processes to operate as
anticipated; the failure of contracted parties to perform; labour
disputes and other risks of the mining industry; delays in obtaining
governmental approvals or financing or in the completion of
exploration, as well as those factors disclosed in the company’s
publicly filed documents. Although the Company has attempted to
identify important factors that could cause actual actions, events or
results to differ materially from those described in forward-looking
as actual results and future events could differ materially from those
anticipated in such statements. Accordingly, readers should not place
undue reliance on forward-looking statements.


SOURCE Guyana Frontier Mining Corp.

Source: PR Newswire