Visible Gold and >10g/t Methods
posted on
Aug 17, 2010 09:28PM
Ultimately Developing a District with Multiple Near-Surface Gold Resources along the +30 km Property in Idaho
From July 9th, 2009 NR. I would not think anything has changed.
Due to the presence of visible gold in some of the core, assay procedures have been discussed with the lab to ensure that the method selected would best represent the actual gold content and not over or under report grade. The majority of the core will be assayed utilizing standard one-assay ton, while samples with visible gold will be analyzed using a metallic screening and sieving method. This method is designed to provide a quantitative gold assay on samples that have coarse particulate gold. The screening procedure separates the coarse gold from the fine gold, which makes it easier to get a total gold assay result for that particular sample.
The method is described as follows:
1. Crush, Pulverize and Sieve 500 grams to -150 mesh, save +150 mesh for metallic gold assay.
2. The pulverized sample (500 grams) is then passed through a "150" mesh screen and the "plus" and "minus" fraction are saved and weighed.
3. The entire "plus" fraction is then fire assayed to get the total gold and a 1 Assay Ton fire assay is done on the "minus" fraction.
4. A weighted average is reported along with the weights and gold results of each fraction.
The selection criteria for samples to be analyzed by metallic screening will be:
- Samples with visible gold.
- 3 sample intervals prior to the sample with visible gold.
- 3 sample intervals after the sample with visible gold.
- Any samples with a “standard” fire assay returning assay greater than 10 gram per ton gold.
- 20 samples selected based on geologic similarities to samples with visible gold.
The purpose of the enhanced assaying procedures will be to develop a statistical database to determine the variability of the mineralization. This will provide data to assist Premium in developing procedures for sample collection and assaying which are representative of the mineralization and reduce the potential for inconsistent results.