Arc unveils 1st drilling results from Singgahan prospect
Monday, May 12 2014 - 12:53 AM WIB
ASX-listed Arc Exploration Ltd announced on Monday that three scout drilling holes for total of 745.9 meters have been completed at Singgahan Prospect located in the southeast corner of the Trenggalek exploration IUP tenement in East Java with assay results from the first and second holes received.
The three holes are TRDD055, TRDD056, and TRDD057. Drilling continues with hole TRDD058 in progress, the company said in an update statement issued jointly with partner Anglo American.
These holes are testing part of an extensive copper-gold-molybdenum soil anomaly underlain by a discrete magnetics high feature and a broader potassium-channel radiometric anomaly.
The statement provides the following details.
Assay results have been received for TRDD055 completed early last month. A significant gold intercept of 17.2 m at 0.65 g/t gold from 27.5 m down-hole, with elevated associated elements such as arsenic-antimony-molybdenum-zinc, was returned in sulphidic silicified calcareous volcaniclastic rocks and incipient garnet-bearing skarn. The peak individual gold result within this interval was 1.08 g/t Au.
Anomalous copper-gold-molybdenum intercepts, including 38 m at 0.032% copper, 0.054 g/t gold & 9 ppm molybdenum from 150 m down-hole, were returned in a quartz-anhydrite-magnetite-sulphide stockworked dioriteintrusion with visible traces of disseminated chalcopyrite and molybdenite mineralisation (see Table 2 and Figure 3). Peak individual results within this interval were 0.069% Cu, 0.129 g/t Au & 27 ppm Mo.
A second hole (TRDD056) collared about 150 m east of TRDD055 was abandoned at a shallow depth of 30.8 m due to poor ground conditions. The bottom of the hole returned an anomalous gold intercept of 1.6 m at 0.17 g/t Au, with elevated associated arsenic-antimony-molybdenum-zinc results, in similar rocks to those intersected in the upper part of TRDD055.
A third hole (TRDD057) was collared on the same drill pad as TRDD055. It was drilled in the opposite direction toTRDD055 to a final depth of 383.4 m and intersected a quartz-sericite-pyrite altered tonalite intrusion hosting localised quartz-anhydrite-pyrite stockwork containing rare traces of disseminated chalcopyrite and molybdenite mineralisation. Sampling of this hole is in progress and assays should be available in 2-3 weeks.
A fourth hole (TRDD058) is in progress and is testing for potential higher grade mineralisation beneath TRDD055.
Although the copper-gold-molybdenum grades intersected in TRDD055 are low they do indicate the presence of porphyry-style veining and mineralisation in the prospect area. The large soil and bench geochemical anomaly identified at Singgahan in previous months has had only limited drill testing and potential remains for a porphyry system to be discovered.
Samples will be sent to a consulting petrologist to confirm that the rock types and alteration assemblages intersected at Singgahan are consistent with a near porphyry environment and to help vector toward zones of potential higher grade mineralisation. These results are expected in 4-6 weeks.
Grid-based soil sampling has been completed over 4 km by 8 km block area that surrounds Jerambah, Buluroto, Sentul and Singgahan prospects. Assay results have been received for about 90% of this program.
A new area of coincident copper-gold-molybdenum soil anomalism of greater than 90 ppm Cu, 20 ppb Au & 4 ppm Mo has highlighted in the recent results. This new area is known as Torongan and is located about 2 km southwest of Jerambah (see Figure 4). Maximum individual soil results returned within this approximately 2 km by 1.7 km area of anomalism are 171 ppm Cu, 0.05 ppm Au and 25 ppm Mo.
Follow-up prospecting is in progress to investigate the source of this large anomaly.
Editing by Reiner Simanjuntak