Resource Geosciences comprises a staff of geologists, technicians, logisticians, and administrative support personnel, dedicated to providing the professional technical and administrative services to clients in Mexico and throughout the Americas.
Resource Geosciences was incorporated in 2000 and is directed by two of its founders: Dr. Matthew Gray, President, and Ing. Mario Castellanos. Geologists and engineers by training, and explorationists by experience, the founders have over seventy years of international exploration experience gained through employment with Placer Dome, BHP, Cambior, Peñoles, and Frisco. Resource Geosciences is a multi-cultural team, and is able to effectively conduct business in English, Spanish, and Portuguese, and the directors have done so in a variety of operating environments including Brazil, Canada, Chile, Costa Rica, Ecuador, Guatemala, Mexico, Nicaragua, Panama, Papua New Guinea, Peru, and the United States.
Resource Geosciences provides services to mining companies, exploration companies, and Goverment agencies that require professional geoscience services.
President and founding partner
Dr. Gray holds degrees from the Colorado School of Mines (B.Sc. - Geological Engineering; Ph.D. - Geology, with Minor in Mineral Economics) and …
Ing. Castellanos is a graduate of the Geology Department of the University of Sonora in Hermosillo, Mexico. His academic thesis described …
Resource Geosciences is qualified to prepare CSA NI43-101 Technical Reports for clients. Public domain reports and publications by Dr. Gray and Resource Geosciences include:
Resource Geosciences frequently gives invited presentations at professional conferences and seminars. Recent presentations include:
Resource Geosciences is a professional practice serving multiple clients, of which many are in direct competition with one another. As a provider of services to these companies Resource Geosciences will at times possess ... highly confidential and proprietary information belonging to client companies. Recognizing that disclosure, inadvertent or otherwise, of such data could cause financial harm to a client, Resource Geosciences will maintain confidential all data we generate for a client, and will not divulge its business relationship with a client without the client's consent. Furthermore, Resource Geosciences explicitly recognizes that all data generated for a client is exclusive data of the client and we will not maintain copies of such data without express consent from the client. Resource Geoscience will notify potential clients of any current Resource Geosciences programs that overlap in geographic region, unless the program is being conducted on client-controlled ground that is not open for acquisition. For example, we would not run concurrent generative programs for two different clients in the same region, but Resource Geosciences could concurrently run a generative program for one client and a project development program for another in the same region, provided that it is disclosed to the later client that Resource Geosciences is already active in the area. Resource Geosciences will never compete with past, present, or future clients. Neither Resource Geosciences nor it's controlling partners will acquire nor attempt to acquire any type of interest in mining properties.
The mining and exploration industry is currently experiencing high demand for qualified exploration professionals of all levels. RGM’s business is to help our clients meet their needs through provision of RGM staff to a client’s
project, however, RGM would like to remind all of its potential clients that RGM’s business is provision of services to clients, not recruitment of staff for clients.
RGM’s professional services agreements stipulate that clients are prohibited from directly hiring any person under contract to RGM. When a client attempts to directly hire RGM staff, the effect is a destabilization of RGM’s entire workforce, and impedes RGM’s ability to effectively provide services.
Please see RGM policy regarding hiring of RGM staff by RGM clients at:
Resource Geosciences is exclusively a professional provider of technical and administrative services and Resource Geosciences never competes with past, present, nor future clients. As such: ...
Whether you represent a mining company, a junior exploration company, a government agency, or any individual or entity that requires collection, compilation, or interpretation of geologic data, Resource Geosciences can help you meet your needs efficiently, professionally, and at a cost savings compared to your own in-house costs....
Ready to start your next project with us? Give us a call or send us an email and we will get back to you as soon as possible!
Phone number +52 (662) 214-2454
Resource Geosciences Incorporated 765A Dorotea Ct Rio Rico, Arizona 85648 USA
Resource Geosciences de Mexico Calle 14 de Abril No. 68 Colonia San Benito Hermosillo, Sonora 83190
RGM’s policy is that clients may not directly hire RGM staff. RGM recognizes that our staff are free to work for whom they please, and indeed RGM loses personnel to better offers from other employers. But just as individuals are free to work for whom they choose, the same is true of RGM. RGM conditions its provision of services by excluding clients from hiring RGM staff. If a client does not respect this policy, RGM will cease providing services to that client in order to avoid the conflicts of interest created.
From RGM’s viewpoint there is no ethical or practical difference between:
Ing. Castellanos is a graduate of the Geology Department of the University of Sonora in Hermosillo, Mexico. His academic thesis described the relationships between differing intrusive phases and formation of the skarn deposit at La Negra, Queretero. Prior to co-founding Resource Geosciences his 14 years of professional exploration experience were spent with Placer Dome, BHP, Peñoles and Frisco, evaluating precious and base metal projects in Latin America. In addition to his responsibilities as Director of Resource Geosciences, Ing. Castellanos acts as project manager for programs conducted on behalf of clients.
“Mike Ressel of Mine Development Associates and Matt Gray and Luis Anchondo of Resource Geosciences Inc., collaborating for a client, taking a literal in depth look at a project.”
“Javier Gray, Matt Gray and Ken Balleweg at base camp for geologic exploration in Clear Creek Canyon, Grand Canyon (photo credit K Balleweg)”
“Matt Gray straddling the Great Unconformity along the Clear Creek Trail, Grand Canyon. Right foot is on Cambrian Tapeats Sandstone, left foot is on Early Proterozoic Vishnu Schist, representing a time gap of ~1.2 billion years.”
“Visiting vein outcrops in the Sunnyside Basin, Silverton Mining District, Colorado.”
“Reviewing hydrothermal alteration in the Red Mountain Mining District, Colorado.”
“Resource Geosciences visited the Silverton Mining District and the San Juan Mountains in Colorado and captured this view of the angular unconformity between the ~1.3 Ga Uncompahgre Formation meta-sediments and 370Ma sandstone of the Elbert Formation”
“June 2020: No this isn’t a volcano erupting, sadly it is the Santa Catalina Mountains on fire, as seen from the RGI office in Rio Rico, Arizona, 105km miles distant.”
“Resource Geosciences geologists Rodolfo Sauceda and Mario Castellanos with Minera y Metalurgia Paika geologist Angel Cordova, examining auriferous silicified outcrop at Paika’s Maiz Azul project, Mulatos District, Sonora.”
“Matt Gray at San Albino gold project of Mako Mining, Nicaragua. Photo looking south at dip slope of San Albino vein, prior to commencement of mining in February 2020.”
“RGI returned to Grand Canyon, Arizona to continue geologic studies. Photo looking downstream of Colorado River, inner gorge of Vishnu Schist and Zoroaster granite capped by Cambrian Tapeats Sandstone..”
“Canine field companions Nubi and Sydney on gently dipping rhyolite tuff beds, Red Springs area.”
Dr. Gray holds degrees from the Colorado School of Mines (B.Sc. - Geological Engineering; Ph.D. - Geology, with Minor in Mineral Economics) and the University of Arizona (M.Sc. - Geosciences). He is an A.I.P.G. Certified Professional Geologist (C.P.G. 10688) and a CSA NI43-101 Qualified Person. His twenty nine years of international exploration experience include directing generative exploration programs and managing advanced project evaluations for Placer Dome and Cambior in the United States, Brazil, Chile, Ecuador, Papua New Guinea, and Mexico. In addition to technical skills and experience related to minerals and water exploration and development, Dr. Gray has successfully managed mine permitting, water rights, and community relocation issues related to mine development in Mexico. He has extensive experience in project development and resource/reserve QA/QC validations. Dr. Gray is bilingual in English and Spanish and resides in Mexico.
Dr. Gray's academic studies were of carbonate-hosted polymetallic replacement deposits and of Archean gold deposits and he has published peer-reviewed academic papers on both.
M. D. Gray, and R. W. Hutchinson New Evidence for Multiple Periods of Gold Emplacement in the Porcupine Mining District, Timmins Area, Ontario, Canada Economic Geology, May 1, 2001; 96(3): 453 - 475. [PDF]
In addition to his responsibilities as President and Director of Resource Geosciences, Dr. Gray acts as a Qualified Person as per the definitions of CSA NI-43-101 for programs conducted on behalf of clients.
Matt Gray, Rodolfo Sauceda, and Mario Castellanos in Panama
Luis Anchondo Senior Geologist Gold Exploration in Nevada
Edmundo Duran Geologist in Nevada
Matthew D Gray Founder
Water Exploration and Well Field Development, Alamos, Sonora, México.
pump test, Piedras Verdes mine, Sonora, México.
Remote Field Camp Provision and Operation, Sierra Madre, Chihuahua, México.
Community Relocation Project, Piedras Verdes, Sonora, Mexico.
Exploration Drill Program Management,
Copper Project, Region III, Chile.
Exploration Drill Program Management, USA
Exploration Drill Program Management, USA
Geologic Mapping, Canadian Cordillera, Matt Gray.
Geologic Mapping, Underground mine. Resource Geosciences Senior Geologist Luis Anchondo, Matt Gray, and client Senior Geologist Frank Powel.