Mr. Michael Hawkins reports
EAST ASIA INTERCEPTS 0.4 G/T GOLD, 0.2% COPPER OVER 415.1 METRES, ENDING IN 0.5 G/T GOLD, 0.2% COPPER OVER 279.4 METRES AT LOWER TENGKERENG PORPHYRY PROJECT
East Asia Minerals Corp. is providing an update on its first diamond drill hole at the Lower Tengkereng project, with the presence of a significant gold-copper porphyry system within the company's highly prospective Barisan porphyry belt, Aceh province, Indonesia. LTD001 encountered 0.39 gram per tonne gold, 0.18 per cent copper over 415.1 metres, including 0.49 g/t gold, 0.22 per cent copper over 279.4 metres, where the hole was stopped due to poor drilling conditions. Additional drilling of Lower Tengkereng is in progress.
LTD001 was drilled with a due-south azimuth and 60-degree dip. The hole was abandoned in mineralization at 417.4 metres due to hole collapse; however, sufficient mineralized porphyry was intersected to confirm the importance of this project. In addition, the overall gold grade and degree of favourable alteration intersected increases with depth. The results validate to the company that the Barisan porphyry belt represents an important gold-copper system with multiple targets and porphyry centres.
LTD001 returned primary gold-copper intersections beneath coincident gold-copper, surface geochemistry and magnetic anomalies associated with porphyry-style alteration. The host rock is diorite. Alteration is predominantly quartz-alunite-clay-iron oxides with 1-per-cent to 5-per-cent quartz veining from one metre to 97 metres, quartz-illite-sericite pyrite with 2-per-cent to 8-per-cent quartz veining, containing variably oxidized pyrite, plus-minus chalcocite veining from 97 metres to 210 metres and quartz-illite-sericite pyrite with 1-per-cent to 10-per-cent quartz veining, containing unoxidized pyrite magnetite, plus-minus chalcocite, plus-minus chalcoppyrite, plus-minus bornite and plus-minus molybdenite from 210 metres to 417.4 metres (end of hole).
DRILLING INTERCEPTS
Hole No. From (m) To (m) Interval (m) Gold (g/t) Copper (%)
LTD-001 2.3 417.4 415.1 0.39 0.18
Including 90.0 417.4 327.4 0.45 0.23
And 138.0 417.4 279.4 0.49 0.22
LTD002 was drilled with a 125-azimuth and 60-degree dip to continue testing for gold-copper mineralization at the Lower Tengkereng porphyry. The target includes a ground magnetic high to the southeast of LTD001, as well as favourable surface geology, geochemistry and drill results from nearby historical drilling. The hole was stopped at 180 metres depth in altered diorite porphyry due to drill string problems and replaced by LTD002A.
Replacement hole LTD002A is progressing well with a 125-degree azimuth and 60-degree dip, targeting the same area as abandoned LTD002. LTD002A encountered andesite cover rock to 48 metres, with illite/clay-alunite-minor silica and iron oxide alteration and 2-per-cent to 5-per-cent quartz veining. From 48 metres to 84 metres the host rock is illite/clay-pyrite-altered quartz diorite porphyry with 1-per-cent to 3-per-cent quartz veining and fracture oxidation. This is followed to the current depth of 217 metres by silica-illite/sericite-pyrite-altered diorite porphyry. In addition to 1-per-cent to 5-per-cent pyrite, the diorite porphyry contains minor chalcocite and up to 3-per-cent quartz veining with minor fracture oxidation to 154 metres, followed by minor magnetite alteration with 1-per-cent to 3-per-cent quartz veining and fracture oxidation to 180 metres, and minor chalcopyrite with up to 10-per-cent quartz veining and fracture oxidation to the current depth. (Refer to drill location map at the company website.)
The company also refers the reader to the Stockwatch news release of Dec. 1, 2008, for the announcement of initial drilling at the Upper Tengkereng project, drilled approximately 1.5 kilometres away from Lower Tengkereng. At that time, Upper Tengkereng was drilled due to ease of access and encountered 646.25 metres averaging 0.39 g/t gold and 0.21 per cent copper, including a significant intersection of 268 metres of 0.57 g/t gold and 0.26 per cent copper. Significant near-surface gold mineralization was also intercepted, including 14 metres to 82 metres (68 metres) of 0.51 g/t gold and 0.21 per cent copper.
The Upper and Lower Tengkereng targets occur as two large outcrop areas of similar porphyry gold-copper mineralization. The company believes Upper and Lower Tengkereng are possibly contiguous, and part of one large system linked at depth, with the intervening area covered by shallow interbedded sedimentary and volcanic rocks.
Barisan porphyry geological setting
East Asia Minerals' Barisan tenements encompass a cluster of six known porphyry centres within a 6.2-kilometre-by-three-kilometre block (view map at the company website). Geological features observed in drill core from Lower and Upper Tengkereng show that this system shares many features of the world's best gold-rich porphyry copper deposits in the circum-Pacific rim. They include:
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The association of gold-copper mineralization with composite porphyry
stocks emplaced into coeval andesitic volcanic rocks at shallow levels;
- Association of K-silicate alteration at depth, which has undergone
partial overprinting with advanced argillic and intermediate argillic
assemblages;
- Strong positive correlation between quartz vein density and gold and
copper distribution mainly represented by disseminated chalcopyrite and
bornite;
- Hydrothermal magnetite associated with quartz veining common at depth
but appears to have been destroyed at higher elevations by later-stage
overprinting hydrothermal alteration;
- The mineralized system is telescoped in which later-stage vuggy, banded
epithermal quartz veins overprint early porphyry-style veins.
Photogeological interpretation of stereoscopic Aster and Pulsar satellite images of this region has identified additional porphyry targets, demonstrating the high prospectivity of this mineralized belt. These targets and the other known porphyry centres will be systematically explored. Samples reported were assayed at Intertek assay laboratories in Jakarta. Lionel Martin, PGeo, the designated qualified person within the meaning of NI 43-101, has reviewed and approves the content of this release.
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