Further Metallurgical Test Work Continues to Add Improvements and Modeled Revenue Increases at Alpala

OTTAWA, April 29, 2020 (GLOBE NEWSWIRE) -- Cornerstone Capital Resources Inc. (“Cornerstone” or “the Company”) (TSXV:CGP) (Frankfurt:GWN) (Berlin:GWN) (OTC:CTNXF) is pleased to announce the following update on the exploration program at its Cascabel copper-gold porphyry joint venture project in northern Ecuador, in which the Company has a 15% interest¹ financed through to completion of a feasibility study plus 8.22% of the shares of joint venture partner and project operator SolGold Plc, for a total direct and indirect interest in Cascabel of 22%.

Figures referred to in this news release can be seen in PDF format by accessing the version of this release on the Company’s website (www.cornerstoneresources.com) or by clicking on the link below:

http://www.cornerstoneresources.com/i/pdf/NR20-11Figures.pdf.

Following the completion of further metallurgical test work at the Alpala deposit on the Cascabel concession, SolGold has received the Phase 2 Test Work Report by ALS Metallurgical Laboratories, Canada. Phase 1 and 2 represent together a representative evaluation of the metallurgy for the whole planned mine life of the Alpala deposit.

Improved recoveries in metallurgical tests across all valuable minerals indicate a potential increase in the value of the Alpala project. Results from these metallurgical test programs form important elements of the Pre-Feasibility Study ("PFS”) currently underway. Phase 2 allowed SolGold to conduct flow-sheet optimization testing followed by flowsheet development.

Highlights of the Phase 2 metallurgical test-work:

• Life of mine increase in gold recovery by 7% compared to results of the Preliminary Economic Assessment (“PEA”) announced May 20, 2019²
• Ability to produce 26%-30% copper concentrate (plus gold and silver) for modeled life of mine
• Low deleterious elements in concentrate for life of mine, such as arsenic, bismuth, cadmium, fluorine and others (see glossary)
• All composite samples from Phase 2 (as in Phase 1) responded well to conventional froth flotation with high valuable metal recovery rates overall
• Mineralogical testing part of this work confirmed that the copper sulphide material was substantially chalcopyrite

The Phase 2 test work program following the PEA builds on the Phase 1 test work previously reported in the PEA and includes: