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Zinc Co announces manganese mineralization at Earaheedy Basin

Steel News - Published on Thu, 28 Oct 2010

Zinc Co announced the results the initial RC drilling program at its Lockeridge manganese prospect in the Earaheedy Basin. The program was designed to test down dip of outcrops of massive manganese oxide dipping at a low angle north into the Earaheedy Basin. 16 holes were completed for 1732 metres. This is the first drilling program ever targeted at manganese in the western Earaheedy Basin.

15 holes intersected a stratigraphic unit of manganese mineralization dipping at 10 degrees north and extending for 1.2 kilometers down dip and 1.6 kilometers along strike. The drilling has not confined the extent of this unit which is from 2 meters to 16 meters thick with an average of 10 meters.

Drilling intersections include:
1. ZTRC014 12 meters 11.1% Mn, 6.3% Fe, 31.5% SiO2, 0.2% P from 28 meters
2. ZTRC017 3 meters 18.0% Mn, 6.6% Fe, 26.6% SiO2, 0.2% P from 37 meters
3. ZTRC023 3 meters 13.0% Mn, 7.5% Fe, 32.4% SiO2, 0.2% P from 14 meters

The manganese occurs in a silty to sandy carbonate unit with bands of hematite siltstone. The major components of this unit were identified by X Ray Diffraction as quartz and carbonate minerals including the manganese carbonate minerals kutnahorite and rhodochrosite with minor braunite.

Zinc Co made the initial discovery of bedded manganese in the Karri Karri Member of the Chiall Formation in the Earaheedy Basin and, as early mover, holds tenements covering 75 strike kilometers of this stratigraphic position. Other companies have followed Zinc Co and announced discoveries of manganese mineralization 60 km south east and 65 kilometers north east of Lockeridge. The manganese mineralization to the north east is within the Frere Formation. These discoveries indicate that manganese occurs throughout the Earaheedy Basin and at more than one stratigraphic level.

Of the various styles of manganese deposits world wide the Earaheedy occurrences most resemble those deposits associated with Proterozoic iron formations such as the giant Kalahari manganese field in South Africa, which is the largest manganese deposit in the world. The similarities include:
1. Palaeoproterozoic age
2. Association with iron formation
3. Basin wide mineralized horizon
4. Manganese carbonate rich ore
5. Repetitive cycles of iron and manganese deposition.

The stratigraphic control on mineralization at Earaheedy indicates that significant tonnages of mineralization could occur within the basin. Higher grades could occur in several situations including:
1. Fault enhanced supergene enrichment
2. A change in the primary mineralization from manganese carbonate dominant to manganese oxide dominant landward from the basin of deposition
3. Enrichment due to post depositional fluid circulation related to deformation in the Stanley Fold Belt along the northern margin of the Earaheedy Basin
4. Increase in grade of the primary carbonate ore.

Posted By : admin on Thu, 28 Oct 2010
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