Arc announces exploration updates on Trenggalek gold project
Thursday, September 1 2016 - 07:23 AM WIB
ASX-listed Arc Exploration Limited unveiled Thursday the following update on exploration work on the Trenggalek Prospect located in East Java Province.
Sentul and Buluroto Prospects
A new phase of diamond drilling commenced at Trenggalek in early February 2016. This program was designed to test for mineralised extensions within the large Sentul and Buluroto epithermal gold veins, which were previously identified with scout diamond drilling by ARX in 2010/11.
Gold results for the first sixteen holes in this latest drilling program were reported in earlier announcements. The results for the last three holes STDH10 to STDH12 at Sentul are summarised below.
The most significant gold intercepts from the latest results are:
- 1.25 m at 4.1 g/t Au from 86.5 m down-hole in STDH10 on Sentul West vein
- 1.1 m at 2.46 g/t Au from 113 m down-hole in STDH10 on Sentul West vein
- 1 m at 1.03 g/t Au from 217 m down-hole in STDH12 on Sentul West vein
Drilling in these two prospects has now ceased while further review and interpretation of the results in conjunction which historic data is undertaken.
Singgahan Prospect
Scout diamond drilling on the Singgahan Prospect located in the southeast corner of the Trenggalek Exploration IUP tenement was conducted in 2014
The four inclined diamond holes (1,541m) drilled at Singgahan completed a fence of holes across part of an extensive copper-gold-molybdenum soil anomaly and coincident magnetic-high anomaly. The source of the soil geochemical anomaly is interpreted to be a weakly mineralised intrusion breccia cropping out at surface. The source of the magnetic high is a small mineralised diorite intrusion that appears to be rootless as modelled by a 3D magnetics inversion analysis. The high-magnetic signature of the diorite is attributed to abundant secondary magnetite occurring as disseminations in porphyry-style quartz-anhydrite veins and potassic-propylitic alteration.
Porphyry-style mineralisation was intersected in these holes which returned multiple low grade copper-goldmolybdenum intercepts.
A petrological investigation completed on selected core samples taken from these holes has confirmed the occurrence of porphyry-style veining and alteration, with copper and molybdenum minerals.
Recent mapping in the area has identified porphyry style mineralisation at the surface. A combined Induced Polarisation Survey and Ground Magnetic survey consisting of 19.9 km on 13 lines has commenced. These results combined with existing aeromagnetic data and detailed geological mapping will be used to define drill targets at Singgahan for the next phase of exploration to be undertaken at Trenggalek by Danusa.
The Trenggalek Exploration IUP tenement covers about 300 square kilometres and is located in the same arc segment that hosts the giant Tumpangpitu porphyry gold-copper deposit in the Southern Mountains of East Java.
Editing by Reiner Simanjuntak