Arc updates drilling results from E. Java gold project
Thursday, August 26 2010 - 02:54 AM WIB
The current 5000 m scout drilling program is nearing completion and has returned high-grade gold results from three prospects scout drilled; Sentul, Buluroto and Kojan, including up to 2 mat 17.2 g/t Au at Sentul.
The objective of this program was to test some of the multiple targets identified on the tenement for potential to host significant gold-silver resources. The drilling reported to-date confirms this potential.
Sentul Prospect
Sentul is a large gold-silver vein system with a cumulative length of over 8 km and widths of 5 to 15 m. It is open along strike at both ends and down-dip.
Two recent holes (TRDD 36a and 38) tested the West Sentul Vein beneath a high-grade intersection previously reported in TRDD 4.
TRDD 36a returned a best intercept of 4 m at 1.17 g/t Au within a zone of 11.55 m at 0.89 g/t Au, and TRDD 38 returned a best intercept of 0.95 m at 2.18 g/t Au within a zone of 5.45 m at 0.51 g/t Au. The drop in gold grade is caused by dilution from late barren quartz in this part of the vein.
Conclusions
The high grade zone in this 450m-Iong segment of the West Sentul Vein is interpreted as a steeply south plunging shoot that is still open at depth.
Multiple ore shoots are common in this style of large gold-vein system and the potential for more high-grade shoots along the 10-15 m wide, 8 km collective length of the Sentul Vein System is considered high. Less than 10% of the Sentul Vein System has been drill tested so far.
Surface work is underway to further evaluate and extend the overall vein system prior to further drilling in 2011.
Buluroto Prospect
At surface, Buluroto is a 200 m long by 100 m wide zone of gold-silver-copper bearing hydrothermal breccia formed near the confluence of two narrow quartz veins.
Three holes recently tested the breccia. Two tested the breccia to a vertical depth of 50 m, and a third deeper hole tested to 150 m vertical depth and beneath a previously reported copper-gold intersection of 24.55 m at 0.21% Cu and 0.51 g/t Au.
TRDD 37 intersected 1 m at 9.39 g/t Au & 8 g/t Ag within 3 m at 6.29 g/t Au & 6 g/t Ag from 2.4 m down-hole, 1 m at 10.9 g/t Au & 304 g/t Ag from 21.3 m and 2 mat 8.73 g/t Au & 48 g/t Ag from 24.5 m down-hole. These occur in sulphidic hydrothermal breccias and quartz-chalcedony stockwork.
TRDD 39 was drilled 20 m below TRDD 37 and returned 2 m at 6.75 g/t Au, 46 g/t Ag & 0.66% copper within an interval of 6.3 m at 2.77 g/t Au & 23 g/t Ag from 30.7 m down-hole. A halo of lower grade gold mineralisation (0.1 to 2 g/t Au) in quartz-chalcedony stockwork extends to the end of the hole. The true-width of the zone is in excess of 20 m.
The deepest hole, TRDD 40, intersected several intervals of low grade gold mineralisation in quartz-chalcedony breccia and stockwork that may together represent a mineralised structural zone of at least 70 m width. The broadest intercept of 14.8 m at 0.38 g/t Au returned from 127.4 m down-hole includes a best 1 m interval of 1.98 g/t Au. The copper grade over this interval is low (<0.05%) with a best single result of 0.16% Cu.
Conclusions
These results are encouraging and confirm locally high gold grades within a lower grade gold-silver-copper envelope in the shallow parts of what could be a large mineralised breccia system. The limits of the mineralised breccia remain to be defined and it is open in all directions.
Surface work is in progress to define the limits of this breccia target prior to further drilling in 2011. (end of release)