Isabel and Isabel Extended

Overview

The Isabel deposit consists of high-grade zinc-lead-copper massive sulphide mineralisation exceptionally rich in silver and indium occurring in fine-grained and breccia quartzites. The sulphides are located on both sides of, and adjacent to a northwest-southeast trending quartz feldspar dyke.

Historical work completed on the deposit and vicinity includes detailed mapping, geochemical soil sampling, underground sampling, geophysical surveying and both percussion and diamond drilling. Great Northern Mining Corporation NL (GNMC) and Mareeba Mining and Exploration Pty. Ltd. (Mareeba Mining) carried out a 57 hole drilling program (percussion and diamond drilling) during 1970-1972.

A historical reserve estimate (non JORC 2012 compliant) of 83,236 long tons at an average grade of 15.3% zinc, 2.8% lead, 0.7% copper, 3.7 ounces silver, 12.1 ounces indium and 25.5 ounces cadmium per ton for the Isabel deposit within 100 metres of the surface for Isabel was estimated in 1972. The known mineralisation at Isabel has not been constrained by the historical drilling and there is material potential to increase the historical resource.

Reconnaissance sampling from Isabel prospect in QLD has confirmed the presence of exceptional high-grade copper-lead-zinc-tin & silver-indium mineralisation, with sampling returning assays up to 1,347 g/t Ag, 5,624 g/t In, 5.7% Cu, 15.4% Pb and 17.3% Zn and 5.2% Sn

 

The Isabel Extended target is located approximately 150m south of the Isabel deposit. In the early 1970’s Mareeba Mining carried out geological mapping, soil geochemistry and an IP survey. Mareeba Mining then completed additional geophysical surveying, geochemistry and drilling in the early 1980s.

Six NQ diameter diamond drill holes targeting geophysical and geochemical anomalies were completed (MIED 1,2 and 3 in 1980, and MIED 4,5 and 7 in 1981) for a total of 1,1740.4m were drilled. Material polymetallic massive sulphide mineralisation was intersected in drill holes MIED 1 and MIED 3.

Hole ID	From (m)	To (m)	Intersection (m)	Cu (%)	Pb (%)	Zn (%)	Sn (%)	As (%)	Ag (g/t)	Mineralisation
MIED 1	91.08	93.37	2.55	2.0	1.0	13.2	1.1	–	409	Fresh Sulphide
MIED 3	177.20	178.65	1.45	3.1	0.0	0.3	0.1	0.1	32	Fresh Sulphide
and	182.13	189.38	7.25	3.3	0.2	0.4	0.2	4.2	173	Fresh Sulphide
Reference: Lady Isabel Extended ML 6647 Herberton NQ Summary Report (1982)

 

Isabel and Isabel Extended are located on EPM 27221, wholly owned by Iltani Resources.