PARDO NEWS
Apr 19, 2010 11:10 ET
Ginguro Announces Preliminary Results of Pardo Gold Project Metallurgical Testwork
SUDBURY, ONTARIO--(Marketwire - April 19, 2010) - Ginguro Exploration Inc. (TSX VENTURE:GEG) is pleased to provide preliminary results of ongoing metallurgical testing of the Pardo gold mineralization currently underway at the SGS laboratories in Lakefield, Ontario.
Direct head grades of the five samples averaged 2.0 g/T gold. After processing much larger samples with gravity separation and initial Carbon in Leach ("CIL") tests, a more statistically valid gold content was arrived at. Individual sample results are as follows:
Sample Location
Direct Head Grade
Calculated Gold Content
Trench 2 Pit A
3.4 g/T Au
3.5 g/T Au
Trench 2 Pit B
5.2 g/T Au
4.6 g/T Au
Northern Showing Pit
0.6 g/T Au
0.6 g/T Au
Tea Lake Pit
0.2 g/T Au
0.4 g/T Au
Line 34 Pit
0.3 g/T Au
0.6 g/T Au
Average
2.0 g/T Au
2.0 g/T Au
Additional key findings of the test work to date are that:
The Gravity Separation test work achieved an average gold recovery of 41% with an average concentrate grade of 1.373 g/T.
Average gold recovery of 94% was achieved using standard Gravity Separation and CIL testing. Optimization of the Cyanidation testing could improve average gold recoveries to above 94%; and
The initial comminution (i.e., grindability) test work indicates that the ore should be of average grindability. The first Bond Ball Mill Work Index ("BWI") for the Northern Showing Pit sample was 14.
It is important to note that, while the average gold measured in the five samples remained almost at 2 g/T, and 3 of the 5 samples returned variances of less than 15%, the Line 34 and Tea Lake samples showed increases in measured gold content of 86% and 72% respectively. The head grade calculated from the assays of the test work streams (i.e. Gravity Separation concentrate, CIL concentrate, and CIL residue) indicate that the grade of the mineralized conglomerate may be higher than what is determined through direct assay of the individual surface or core samples.
Ginguro delivered five separate 500 pound samples to SGS Lakefield, representing gold mineralization typically encountered in the host conglomerates at Pardo. Field observations, as well as recent microscopic analysis, show that the gold in the Pardo conglomerates is nuggety in nature, and yields highly variable gold grades from typical grab or core samples.
The 500 pound samples were taken from pits over a widespread area, measuring approximately 5 kilometers in a north-south trend.
The direct head assays utilize two sub-samples, taken from a 2 kg charge from each of the five mineralized samples. The mineral processing tests utilize a 10 kg charge. The larger sample size allows for a more accurate account of the gold from a particular mineralized zone.
To date, the Gravity Separation (Knelson-Mosley) test work has been completed, as well as the initial set of CIL cyanidation tests. Cyanidation optimization tests are currently underway, which will be followed up by whole ore cyanidation tests. The comminution test work (BWI) has also begun.
The Company will be initiating field work at Pardo, led by its team of Witwatersrand geologists, in early May.