Day: May 23, 2012

Citation Resources Inc. is pleased to provide an update on its initial reconnaissance exploration program including stream sampling, rock chip sampling and geologic mapping of portions of its approximately 41,000 hectare Biricu Project situated in the Guerrero Gold Belt, Mexico.

Sierra Madre Developments Inc. and its partner Riverside Resources Inc. are pleased to announce that a new gold anomaly has been discovered less than 2 km south of the El Capitan gold zone currently being drilled (2,500 meter diamond core drill program) by Sierra Madre. This new epithermal gold area called the Pinchanzo zone has initial surface assay samples (21 samples) returning up to 2.38 g/t gold with 20 percent of the samples returning greater than 1 g/t gold. A follow up mapping and sampling program is now underway.

Mammoth Resources Corp. is pleased to report additional gold and silver results from its ongoing mapping, trenching and sampling program at the 290 square kilometre Urique Project, located in Chihuahua State, Mexico. The Urique Project is surrounded on three sides by Goldcorp’s El Sauzal gold mine to the south, Kimber Resources’ Monterde property to the north and Paramount Gold and Silver’s San Miguel project to the west (refer to Figure 1. Location of Mammoth Resources – Yale Resources Urique Joint Venture, Chihuahua State, Mexico). Work is being supervised by Mammoth Vice President Exploration, Richard Simpson, P. Geo, and is being carried out by Yale Resources geologists. Mammoth is optioning the Urique Project from Yale Resources (for terms of option agreement please refer to the Company’s news release dated February 24, 2012, available under the Company’s profile on www.sedar.com ).

Revolution Resources Corp. is pleased to report that the Company has advanced the exploration program after receiving high grade surface and underground sampling results at its La Bufa and Universo Properties in Mexico. High grade gold, silver and variable copper mineralization suggests multiple prospective epithermal targets and extensions to the historically producing Carmen Mine at La Bufa and the Cinco Estrellas Mine at Universo. Drilling is currently underway.

Yale Resources Ltd. is pleased to report additional gold and silver results from its ongoing comprehensive work program at the 290 square kilometre Urique Project, located in Chihuahua State, Mexico, immediately north of Goldcorp’s El Sauzal gold mine and immediately south of Kimber Resources’ Monterde Property. Work at Urique is being performed on behalf of optionee Mammoth Resources Ltd.

Goldgroup Mining Inc. has had its Change of Soil Use Permit, also known as the “Estudio Técnico Justificativo para Cambio de Uso de Suelo”, returned to the Company, for its 100% owned Caballo Blanco gold project, from the Ministry of Environment and Natural Resources, also known as the Secretaría de Medio Ambiente y Recurso Naturales (“SEMARNAT”). Goldgroup submitted the ETJ to SEMARNAT, which is the federal environmental regulatory agency in Mexico, on December 16, 2011. The ETJ is evaluated by the regional office of SEMARNAT in Veracruz. Comments by SEMARNAT request that the Company provide further details on the following information for its ETJ application:

San Marco Resources Inc. is pleased to report results from the first phase of core drilling at its 100% optioned Los Carlos property in the “Sonora Mojave Megashear”, Sonora State, Mexico.

Avino Silver & Gold Mines Ltd. is pleased to announce further results from the 2012 drill program on the Elena – Tolosa zone at its main mine located 80 km NE of Durango, Mexico.

Prospero Silver Corp. is pleased to announce completion of an area wide mapping and sampling survey of the Matorral dike and vein system in the northeastern sector of its Santa Maria del Oro project in Durango State, Mexico. The following features emerge from this survey: