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استخراج الذهب في تمنراست الجزائر
#1
الخبر غير مترجم للعربية ولكن سوف نحاول نترجمته عند توفر الوقت ان شاء الله 


Algeria
APM entered into a subscription agreement with GMA Resources, a London AIM listed company. GMA owns a controlling 52 per cent stake in ENOR spa ("ENOR"), an Algerian based operating company for the Tirek-Amesmessa project, with the remainder owned by Sonatrach, the Algerian state-owned oil and gas company.
APM has committed to buying additional shares during 2011 so that by the mid 2011 it will potentially own 27% of GMA shares.
The proceeds of the Subscription will be used for general working capital purposes, to expand on the Company's existing exploration activities and to do preliminary work on the five year plan for expansion.
GMA Resources History & Overview
Algeria is the second largest country in Africa (by area) with a population of approximately 34 million. During 2000, Algeria embarked on a new series of reforms to open up the private sector and provide a supportive and transparent environment to encourage foreign investment. A new mining law was promulgated and a new privatization act signified the intent of the Algerian government to attract foreign entrepreneurship into the domestic mining sector and exploit its potential. A key part of the new mining law was the rescinding of the 49 per cent limit on the level of foreign participation when entering into a formal association with an Algerian state enterprise to exploit strategic deposits such as gold.
GMA was incorporated in Australia on 17 May 2002 for the purpose of participating in a tendering process for the acquisition of a 52 per cent interest in an Algerian based company, ENOR, the beneficiary of the Tirek-Amesmessa gold project in the Sahara of southern Algeria. Following an international tender launched by ENOR for the development and operation of the Tirek-Amesmessa permit, GMA was chosen as the successful bidder.
ENOR currently holds an exploitation permit dated 21 October 1992 granted by the Algerian Ministry of Energy and Mines for a period of 20 years (from 10 February 1993) over an area of approximately 1400 km2 containing the former Tirek gold mine, the Amesmessa gold mine and various other prospects and mineralized occurrences within the property known as the ZITA or intermediate zone between Tirek and Amesmessa. The exploitation permit area is located approximately 400 km south west of the city of Tamanrasset in the Hoggar region of Southern Algeria. The Tirek-Amesmessa goldfield was discovered by the Algerian government agency ORGM in the 1970s. Following prospecting and sampling exploration programs in the permit area in the late 1980's and early 1990's by ORGM, ENOR was formed for the purpose of developing and bringing the Tirek and Amesmessa gold deposits into production. Following legislative reforms in Algeria, including the passing of the new mining law and privatization act in 2001, GMA won the Tender and subsequently entered into the Subscription Agreement.
Map of Algeria & Location of Concession
[صورة: map-of-algeria.png]
GMA Resources Corporate Structure
[صورة: gma-resource-corporate.png]
Amesmessa Gold Project
The year 2010 marked the third year of production from the Company’s 52% owned Amesmessa operation. Performance of Amesmessa Mine can be found in Table 1.

Table 1 – 2010 Production Performance of Amesmessa Mine.

[صورة: w0g9uxI.jpg]


Exploration
During 2009, a regional review of the potential of the Amesmessa-Tirek Concession was conducted. The work was initially done by the Australian mapping specialist firm Earthscan, who have developed particular expertise in identifying alteration zones using the satellite imagery known as Aster. Their review identified 76 alteration zones predominately on the Amesmessa-Tirek main shear zone running the length of the concession. Earthscan identified a number of new alteration zones also running in parallel with part of the existing shear zone highlighting the opportunity for a far wider mineralization zone than previously thought. There were additional isolated alteration zones identified also away from the known shear zone.
Each of these alteration zones has subsequently been investigated and the most prospective are currently being geochemically tested through a soil sampling program to be followed by a drilling program.
Southern Geophysical Ltd was engaged to complete the interpretation of a previously flown aeromagnetic survey over the Amesmessa-Tirek concession. This interpretation identified a number of further anomalies with some overlying or running in parallel
Exploration Update- March 2011.
Highlights
  • New drill results have confirmed wide mineralized zones running parallel with the existing mined quartz veins, as anticipated. 
  • Results to date include;
    • ARC 67- from 0m, 28m at 0.74 g/t
    • ARC 74- from 0m, 27m at 0.62 g/t (hole ended whilst still in mineralized zone)
    • ARC 91- from 0m, 53m at 0.49 g/t
    • ARC 127- from 8m, 20m at 1.01 g/t
    • ARC 140- from 26m, 24m at 0.50 g/t (hole ended whilst still in mineralized zone)
    The results shown in Table 2 below demonstrate a continuing trend of a wide, low grade mineralised zone running parallel with the known narrow quartz vein system. The results shown below include both new drill holes (being reported as part of this update) and those drill holes reported previously, in respect of drilling of the coincident soil in gold anomalies in the three Aster anomalies completed to date (TA 47, 52 and 54).Table 2- Significant Mineralised “Alteration” Intercepts
[صورة: BL4u1AB.png]


Note 2) * eoh= end of hole, the point where drilling stopped
Note 3) only holes with an average of >0.3g/t Au over 20m are reported in Table 1.

After reviewing the 105 holes that have been drilled in these three Aster anomalies, the Board believes that the Tirek - Amessmessa Concession remains an attractive exploration opportunity. The results in Table 1 demonstrate that 20 holes returned intercepts measuring wider than 20 metres and at grades greater than 0.3 g/t (using a cut off grade of 0.1 g/t). Although these results are encouraging, they do not yet represent economically viable grades for commercial production.  
In addition, a secondary strategy of drilling the area around Vein 7 South is ongoing. Exploration from previous drilling campaigns by the Algerian government, and subsequent drilling by GMA, has identified a potentially very prospective zone which is hoped will provide potential near term ore for the existing mining operation, depending on exploration success. Best results to date in this region include the following, as previously reported:
  • ARC 23 from 11m, 16m at 3.89 g/t

  • ARC 37 from 71m, 11m at 13.25 g/t

  • ARC 61 from 61m, 7m at 18.48 g/t
In the last few months an additional 29 holes have been drilled in the Vein 7 area, with more planned, depending on assay results expected in March and April.
Now that this new wide mineralised zone has been confirmed with confidence, the Board has made it a priority to rapidly drill test the most promising coincident Aster and gold in soil anomalies. The economic viability of the Amesmessa mine relies on new exploration success to provide an alternative source of ore to the deepening, narrow quartz veins currently being mined.
The Challenge for Amesmessa
Although 2010 provided a number of continuing challenges in respect to logistics, the one key fact that has become apparent is that gold recovery from the heap leach process is well below what was anticipated. In addition to this there has been a significant fall in grade from 2009 to 2010 heavily impacting gold produced.
During 2009 and early 2010, Ausenco (an Australian engineering and mineral processing company) were engaged to assist in the evaluation of the heap leach operation. During this period, a review of the existing metallurgical test work was completed. This historical test work was then supported by a new program of test work to better understand metallurgical characteristics of the Amesmessa ore from near surface ore to ore at depth (25m). The test work encompassed the quartz veins and surrounding mineralized zones. This test work confirmed that the gold recovery achieved by the existing heap leach operation to date was to be expected over the life of the operation due to the nature of the ore.
Importantly, however, the test work also highlighted that a carbon in leach (CIL) pilot plant process facility could be expected to improve gold recoveries significantly as was demonstrated by the Tirek CIL when it was working prior to decommissioning in 2007. The Tirek plant was recommissioned in 2010 but the lack of high grade ore limited gold production at the mine which also has again impacted on gold production.


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