Goldsource Mines Inc. ("Goldsource" or the "Company") announced additional infill and expansion drill results for the Company's 100%-owned Eagle Mountain Gold Project in Guyana, South America. Newly reported results are for 29 core holes totaling 3,269 metres from the Bacchus, Bottle Bank, No. 1 Hill and Bucket Shaft areas of the Eagle Mountain deposit. Another 7 core holes totaling 803 metres are for the Salbora deposit. These drill results represent the final set of infill and expansion drill results from the 2021 program and are the final drill results to be included in the updated Mineral Resource Estimate ("MRE"), which the Company anticipates completing by year-end, 2021. In total, the updated MRE will reflect an estimated 21,000 metres of additional core drilling completed from November 6, 2020, the cut-off date for the February 2021 MRE ("February MRE"). The majority of the drilling was infill, testing the continuity of the shallow sub-horizontal zones of the Eagle Mountain deposit and the sub-vertical breccia zones of the Salbora deposit. The expansion drilling was designed to test for lateral extensions of the Eagle Mountain zones to the north and southwest and for new sub-horizontal zones at depth. The February MRE is contained in a report titled "Eagle Mountain Gold Project, Potaro - Siparuni Region Guyana, NI 43-101 Technical Report", dated April 7, 2021, with an Effective Date of February 17, 2021. In parallel, the Company continues to progress the 5,000-metre Phase 2 exploration program that is designed to test known geophysical targets and follow up on prospects along the Salbora-Powis structural trend. Drilling at the Toucan and Powis prospects is progressing well with results expected in the near term. Eagle Mountain Deposit - No.1 Hill and Bowl Areas: Results for 10 core holes totaling 1,399 metres. In the No. 1 Hill area, infill hole EMD21-193 intersected near-surface high-grade mineralization of 16.5 metres (estimated true width ("ETW") of 14.2 metres) grading 20.04 grams per tonne ("gpt") gpt in saprolite. While this area was within the Indicated Mineral Resource, the hole returned significantly higher grades than what was previously estimated. Separately, EMD21-193 intersected 21.0 metres (ETW of 18.2 metres) grading 1.32 gpt gold starting 93 metres down the hole. The hole successfully tested the continuity of the lower sub-horizontal zone within the Inferred Mineral Resource for potential conversion to indicated resource. Expansion drilling in the Bowl area intersected several new sub-horizontal zones at depth in fresh rock, which the Company interprets as a continuation of the zones of No.1 Hill approximately 250 metres to the south-east. The uppermost zone in expansion hole EMX21-004 intersected 1.5 metres grading 9.69 gpt (ETW of 1.5 metres) starting 39.0 metres down the hole. Eagle Mountain Deposit - Bacchus and Bucket Shaft Areas: Results for 19 core holes totaling 1,870 metres. Expansion drill hole EME21-147 intersected 7.5 metres (ETW of 6.5 metres) grading 1.32 gpt gold starting 25.5 metres down the hole, confirming the extension of shallow sub-horizontal zones in the gap between the Bacchus and Friendly areas. Drill hole EME21-141, approximately 80 metres to the south, intersected 10.5 metres (ETW of 6.7 metres) grading 1.12 gpt gold in a deeper interval, starting 81 metres down the hole. Infill drill hole EMD21-179 intersected 1.5 metres (ETW of 1.2 metres) grading 10.90 gpt gold starting 15 metres down the hole in saprolite. Salbora Deposit - Salbora-Powis Trend: Results for 7 core holes totaling 803 metres. Infill drilling tested the edges of the Indicated Mineral Resource and at depth within the Inferred Mineral Resource outline. Infill drill hole EME21-151 intersected 1.5 metres (ETW of 1.4 metres) grading 18.98 gpt gold starting 34.5 metres down the hole. Infill drill holes EME21-153 intersected 4.5 metres (ETW of 3.5 metres) grading 7.70 gpt gold starting 112.5 metres down the hole and EME21-155 intersected 1.5 metres (ETW of 1.2 metres) grading 37.86 gpt gold starting 124.5 metres down the hole. These higher-grade intersections, approximately 80-100 metres below the Inferred Mineral Resource, correspond with the intersection of sub-vertical breccia structures that are typical of the Salbora-Powis trend with recently interpreted sub-horizontal structures that are similar to those of the Eagle Mountain deposit 1.5 kilometres to the south-east.