GoldMining Inc.
For the period ended Nov 30, 2023. Filed Feb 27, 2024.
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The yearly report of certain Canadian companies, filed under a joint US and Canadian system. It is the main yearly account these companies give US investors, largely as filed in Canada.
FY2023 · Filed Feb 27, 2024
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Contents
EX-99.1 · BGC Sampling
BGC Sampling
It was confirmed in the São Jorge Technical Report that BGC sampling procedures were in accordance with mining industry best practices. All procedures were summarized in the São Jorge Technical Report.
Coarse Reject Duplicate Sampling
When an original sample was made into a smaller sub-sample, it was crushed and split then pulverized and split again. The final sub-sample is never exactly the same grade as the original. The coarse duplicates measure this error.
| ● | A coarse reject sample (returned from the lab) is split into two equal halves (CDA and CDB) ideally using a clean riffle-splitter. If a riffle-splitter is not available, a good cone-and quarter split is acceptable. The duplicates (CDA and CDB) are inserted at every 44th and 46th number in the sampling sequence. |
| ● | The technicians usually made sure that they have enough coarse reject samples which should grade between 0.3 and 1.0 g/t Au. |
| ● | ¼ core samples are not duplicates and they are not used as duplicates because it is expected to indicate the short-range variability of the mineralization (in the case of gold, it is normally high). |
Blank Samples
Contamination can occur in a lab especially with gold as it sticks to the equipment. A blank sample tests if contamination has occurred due to inadequate clean out of equipment between samples; it should return an Au value of less than twice the detection limit.
| ● | BGC blank material consists of coarse crushed aggregate from the "Geraldo Mineiro" Granite quarry which contains less than 0.005 ppm Au. |
| ● | Insert 2 blanks within/after mineralization per 100 samples and a blank as the first sample of each batch. |
Standard Samples
Standards are the best way to measure the instrument or analytical error and are inserted by the mining company. BGC used low, medium and high-grade standards. The standard samples are pre-packaged as 50 gram sachets purchased from Rocklab.
Sample Dispatch and Sample Logs
BGC sent the samples as each batch was ready. The team confirmed that they followed the procedures as described below:
| ● | did not submit a batch with less than 80 samples and a batch never mixed projects; |
| ● | the senior technician prepared the sample submission sheet and the laboratory requisition form, and emailed them to the laboratory before the samples arrived at the lab. The document for the lab contained only be a list of the sample numbers, security tags and volume numbers (there was nothing to indicate which samples were QA/QC samples); |
| ● | the complete sample sheet (showing QA/QC samples) was emailed to the senior geologist and the database manager as soon as the samples were dispatched; and |
| ● | the senior technician kept an organized digital and paper directory of all the sampling information. |
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