We are an independent provider of integrated geoscience and exploration services to mining and exploration companies

Resource Geoscience's founders and directors comprise a bilingual English-Spanish, multi-cultural
team with over 80 years of international experience

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What's New?

About Us

Who We Are

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.


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History

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


Who We Serve

Resource Geosciences provides services to mining companies, exploration companies, and Goverment agencies that require professional geoscience services.





Our Founders



President and founding partner

Matthew D Gray

Dr. Gray holds degrees from the Colorado School of Mines (B.Sc. - Geological Engineering; Ph.D. - Geology, with Minor in Mineral Economics) and …

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Man with backpack

Founding Partner

Mario Castellanos

Ing. Castellanos is a graduate of the Geology Department of the University of Sonora in Hermosillo, Mexico. His academic thesis described …

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At Your Service

Technical - Minerals

  • "Turnkey" Exploration Program Administration and Management

Administrative

Representation and Administration of Mexican Subsidiaries of Foreign Companies.


Technical - Water

Water exploration and well field development of non-conventional aquifers!

Logistical

  • Construction, provision, and operation of remote field camps.

Reports And Presentations


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:

Code of Ethics

Code of Ethics / Conduct

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.


Ethical Obligations of Client

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 ...


What We Do Not Do

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: ...


Why us?


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.

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Let's Get In Touch

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

mail@resourcegeosciences.com

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

Hiring Policy

RGM Policy on Recruitment of RGM Staff by RGM Clients

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.

Ethical Relationship Between RGM and Client

From RGM’s viewpoint there is no ethical or practical difference between:

  1. RGM directly recruiting away employees of a client company
  2. A client recruiting employees from RGM’s personnel base. Both are equally unethical and create a direct conflict of interest between RGM and the client.

Our clients

Mario Castellanos T.

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.

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January 2021.

“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.”

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December 2020.

“Javier Gray, Matt Gray and Ken Balleweg at base camp for geologic exploration in Clear Creek Canyon, Grand Canyon (photo credit K Balleweg)”

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December 2020.

“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.”

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December 2020.

“Matt Gray examining mud cracks, evidence of shallow near shore depositional environment in fallen block of Cambrian Tapeats Sandstone, Clear Creek Canyon, Grand Canyon.”

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December 2020.

“Matt Gray examining mud cracks, evidence of shallow near shore depositional environment in fallen block of Cambrian Tapeats Sandstone, Clear Creek Canyon, Grand Canyon.”

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September 2020.

“Visiting vein outcrops in the Sunnyside Basin, Silverton Mining District, Colorado.”

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September 2020.

“Reviewing hydrothermal alteration in the Red Mountain Mining District, Colorado.”

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July 2020.

“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”

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December 2020.

“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.”

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Feb 2020.

“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.”

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Feb 2020.

“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.”

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September 2019.

“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..”

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September 2019.

“Canine field companions Nubi and Sydney on gently dipping rhyolite tuff beds, Red Springs area.”

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Matthew D Gray, Ph.D., CPG #10688

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.

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Our People

Our People

Matt Gray
Rodolfo Sauceda &
Mario Castellanos
in Panama

Matt Gray, Rodolfo Sauceda, and Mario Castellanos in Panama

Luis Anchondo
Senior Geologist
Gold Exploration
in Nevada

Luis Anchondo Senior Geologist Gold Exploration in Nevada

Rodolfo Sauceda
in Panama

Rodolfo Sauceda
in Panama

Edmundo Duran
Geologist
in Nevada

Edmundo Duran Geologist in Nevada

Matthew D Gray
Founder

Matthew D Gray Founder

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