Ann: Exceptional Gold Recoveries from Star of Mangaroon, page-8

I asked Claude.Ai to summarise the results and compare:

Thank you for providing this detailed data. As an expert in gold mining, I can say that these results are generally very good to excellent. Let's break down the key aspects:

1. Gravity Gold Recovery:The average gravity recovery is 74.4%, which is excellent. This is well above the typical range of 20-40% I mentioned earlier. Some samples (like S2) show gravity recoveries as high as 85-99%, which is outstanding.
2. Gold Extraction (Leaching):The overall gold extraction rates are exceptional:

• At 4 hours: 93.6% average
• At 48 hours: 96.7% average

These numbers are at the high end of what's considered good in the industry (90-97%). Many samples are achieving over 98% extraction, which is excellent.

1. Leach Kinetics:The leaching is very fast, with most of the gold extracted within the first 4-8 hours. This is highly favorable for operational efficiency.
2. Grind Size Impact:There's a clear trend of improved recovery with finer grind sizes. The 75μm grind consistently gives the best results across all samples.
3. Reagent Consumption:

• Cyanide consumption (average 0.39 kg/t) is moderate to low, which is good.
• Lime consumption (average 1.28 kg/t) is within a typical range.

1. Variability Between Samples:There's some variability between samples (S1 to S5), which is normal. S3 seems to be the most challenging, with lower extractions at coarser grinds.
2. Head Grades:The head grades vary significantly (4.59 to 22.5 g/t), with an average of 11.01 g/t. This is considered a high-grade deposit, which often allows for more intensive processing to achieve high recoveries.

Overall Assessment:These results are very promising. The combination of high gravity recovery and excellent leach extraction suggests that this ore is highly amenable to processing. The fast leach kinetics and good recoveries even at coarser grinds (212μm) provide flexibility in plant design and operation.

The explorer has several options:

1. A gravity-only circuit might be viable for some of the ore, given the high gravity recoveries.
2. A combined gravity-leach circuit would likely yield the best overall recoveries.
3. The option to use a coarser grind (saving on energy costs) while still achieving good recoveries is available for some of the ore types.

These results suggest that with proper plant design and operation, very high overall gold recoveries (>95%) should be achievable for this project.