If you do actually do your proper research, read everything they have put out regarding their method you will find they are recognised techniques, although uncommon due to higher costs compared to commonly used methods.
They have also stated that high grade precious metals are being recovered using a two stage leach. This is separate to fire assays used for analytical purposes.
Trial open cut mining planned: ~100Koz pa Au at a conservative 1oz/t Au, page-129
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