Scottsdale, Arizona--(Newsfile Corp. - March 16, 2021) - TriStar Gold Inc. (TSXV: TSG) (OTCQX: TSGZF) (the Company or TriStar) is pleased to announce an interim mineral resource estimate for the Castelo de Sonhos gold project in Pará State Brazil. This model incorporates new information available at the end of 2020; drilling is still ongoing so an updated estimate will be completed in the upcoming months to be used in the prefeasibility study. The interim estimate shows that the CDS Project now has:

1.5 Moz of gold in the Indicated category at a grade of 1.2 g/t contained in 40.1 Mt and
0.7 Moz in the Inferred category at a grade of 1.0 g/t gold contained in 22.2 Mt.

"This interim resource estimate already exceeds what we had targeted as a base for the preliminary feasibility study (PFS). We're continuing to drill, and will have more drill results to add when resources are updated for the PFS. Grade remains strong, especially in Esperança South which anchors the project." says Nick Appleyard, TriStar's President and CEO. " This interim model will be used to target any remaining drilling needed to eliminate gaps and to better delineate the extension that has opened up on the northern end of Esperança South, as well as to locate geotechnical investigations for pit wall stability."

Table 1, Mineral resource estimate1 for the Castelo de Sonhos gold project (with an effective date of December 31, 2020) above a reporting cutoff 2 of 0.3 g/t Au. The Qualified Person is TriStar's Vice President Mo Srivastava.

Region Classification Tonnage (Mt) Grade (g/t Au) Metal Content3 (Moz Au)
Esperança South Indicated 24.5 1.3 1.1
Inferred 10.4 1.1 0.4
Esperança East Indicated 2.4 1.1 0.1
Inferred 9.4 0.9 0.3
Esperança Center Indicated 13.1 0.8 0.3
Inferred 2.4 0.9 0.1
Project Total Indicated 40.1 1.2 1.5
Inferred 22.2 1.0 0.7

1Project totals may appear not to sum correctly since all numbers have been rounded to reflect the precision of Inferred and Indicated mineral resource estimates.

2The reporting cutoff corresponds to the marginal cutoff grade for an open pit with processing + G&A cost of $US 12/t, metallurgical recovery of 98% and a gold price of $US 1,250/oz. To meet the requirement of "reasonable prospect for eventual economic extraction" the mineral resources must also fall within a bounding pit shell with 55° walls. These are mineral resources and not reserves and as such do not have demonstrated economic viability.

3The metal content estimates reflect gold in situ, and do not include factors such as external dilution, mining losses and process recovery losses.

4TriStar is not aware of any environmental, permitting, legal, title, taxation, socio-economic, marketing or political factors that might materially affect these mineral resource estimates.


Resource Estimation

Data base

The drill hole collar data base used for the model is the one available at the end of January 2021, at which point in time assays were available for all reverse circulation holes up through RC-20-550 and for all diamond drill holes up through CSH-20-491.

Geological model

Shown in Figure 1, are examples of the litho-geochemical units and erosional surfaces on a cross-section interpreted with the help of GoldSpot Discoveries. Across the entire plateau, 15 units were interpreted and rendered as wire-framed solids. Some of these are sedimentary units that run sub-parallel to the bowl-shaped stratigraphy of the plateau's meta-sediments. Others do not run parallel to the general bedding direction; instead, they are non-sedimentary rocks that cut across the stratigraphy. These were grouped into seven domains, separated by two erosional unconformities. see & read more on
https://www.tristargold.com/news/tristar-doubles-indicated-resources-as-drilling-co-2476/