VANCOUVER, BRITISH COLUMBIA--(Marketwired - June 1, 2017) - Riverside Resources Inc. ("Riverside" or the "Company") (TSX VENTURE:RRI)(OTC PINK:RVSDF)(FRANKFURT:R99), has regained a 100% interest in the Thor Copper Project (the "Project"), as the Company's joint-venture partner, a subsidiary of Antofagasta plc ("Antofagasta"), has elected not to complete the C$5M in exploration expenditure required to earn a 65% interest in the Project. The Thor Copper Project is located in north-eastern Sonora along the main copper producing belt of Mexico. Riverside and Antofagasta completed an initial proof-of-concept drill program to test for a Laramide aged porphyry-intrusive system. The first four (4) drill holes ever drilled at Thor confirmed the concept, with three of the four drill holes intersecting a large Laramide-aged porphyry style quartz-sericite-pyrite stockwork system. The initial drill holes did not return sufficient gold or copper assays for partner Antofagasta to continue, but the limited drilling that was completed was successful in hitting alteration and providing support for further exploration.