Resource Geosciences

is an independent provider of integrated geoscience and exploration services to mining and exploration companies, government agencies, and land use planners. Resource Geosciences staff includes "Qualified Persons" according to CSA NI43-101 and RGM is a provider of independent NI 43-101F1 Technical Reports.

Resource Geosciences is based in Rio Rico, Arizona and Hermosillo, Sonora, Mexico, however we provide services to clients throughout the Americas who require collection, compilation, or interpretation of geologic data, or professional administration and management of exploration programs.

Resource Geoscience's founders and directors comprise a bilingual English-Spanish, multi-cultural team with over 80 years of international experience. Resource Geosciences provides field based technical services, and also functions as a professional practice offering professional administration and project management services on an outsourced basis to client companies. By contracting field based technical services to us, clients are able to utilize expertise that may not be available in-house, or implement exploration and geologic programs without incurring the significant costs of maintaining staff on payroll. Clients pay for the services of geoscience professionals only on an as needed basis, and avoid the costs associated with hiring, maintaining, and reducing staffs. By contracting professional administration services to us clients are able to maintain a legal corporate entity in Mexico without the costs of opening and maintaining a dedicated Mexico based office. Our professional administration services are particularly useful for foreign-based companies that wish to form or maintain a Mexican subsidiary at minimal cost.

We are exclusively a provider of technical and administrative services. Resource Geosciences does not acquire interests in mining projects for its own account nor promote projects for clients.

Click here for our

Statement of Qualifications

What's New?

2019 March: Resource Geosciences celebrates 15 year employment anniversary  for Chief Accountant Alfonso Castañeda, Geotechnician Carlos Villalpando, and Geologist Rodolfo Sauceda. 

L to R: Resource Geosciences technician Carlos Villalpando, Accountant Alfonso Castañeda, and Geologist Rodolfo Sauceda.

Celebratory lunch!  The three 15 year anniversary employees at far end of table.

2018 December: Resource Geosciences presented  talks at the Arizona SME 2018 meeting in Tucson.

Resource Geosciences partner Fernando Oviedo (at lecturn) chairs the Mexico session at the SME Arizona 2018 meeting.  Matt Gray (seated, far left) and Resource Geosciences geochemist Dr. Francisco Querol (seated far right) presented talks at the session.

Orogenic gold deposits: Mexico’s endowment and future developments in the Altar Trend, Sonora - Dr. Matthew D. Gray

Matt Gray presenting at SME Arizona 2018 meeting.

2018 October: Resource Geosciences presented a talk on orogenic gold at the 13th Congreso Internacional Minero Sonora 2018.

2018 October: Reviewing geology of Red Canyon, Grand Canyon.



Invertebrate tracks in Permian Coconino sandstone along New Hance Trail.

Karst infill in Redwall Limestone, along New Hance Trail.

Ripple marks in mudstone strata interlayer in Proterozoic Bass Limestone, along New Hance Trail.



Unconformity exposed in Red Canyon.  Flat lying Cambrian Tapeats sandstone overlaying tilted Proterozoic strata comprising Hakatai Shale (red) overlain by Shinumo Quartzite (brown).  Note thinning and onlap of Tapeats strata adjacent to peak of Shinumo Quartzite in center right of photo.  Peak was above sea level at the time of sea leval encroachment and deposition of Tapeats sands.

Dike cutting Hakatai Shale in tributary to Red Canton.  Dike boundary shown by dashed yellow line.  Note darkening or Hakatai Shale in altered zone adjacent to dike.

2018 August: Drill program "best practices" and QA QC training short course presented for client, on site and at the drill rig.

Drill crews, project geologists, and project technicians participating in a hand-on pragmatic "best practices" and QA QC short course taught by Dr. Matthew Gray.

2018 July: Underground mine mapping to aid in creation of accurate geologic and resource models, epithermal Au project. 

Resource Geosciences' geologists Luis Anchondo (left, standing) and Matt Gray (right, standing) and consultant geologist Frank Powell (front).

2018 July: Assisting Orla Mining at the Camino Rojo Gold Project and co-author of  "Preliminary Economic Asessment CSA NI43-101 Technical Report on the Camino Rojo Gold Project, Municipio of Mazapil, Zacatecas, Mexico"Resource Geosciences' geologists Matthew Gray and Rodolfo Sauceda at the Camino Rojo Gold Project, Zacatecas, of Orla Mining.

2018 June: Reviewing glacial and structural geology of the Sangre de Cristo Mountains, Colorado.

Looking E-NE from crest of Sangre de Cristo Mountains, Saguache and Custer Counties, CO, at lobate rock glacier (outlined in yellow) descending from cirque in the headwaters of glacial valley hosting South Branch Brush Creek.

Matthew D and Matthew J Gray, view looking SE at un-named 4,018m (13,220 ft) peak of Pennsylvanian-Permian Sangre de Cristo Formation (shallow marine sedimentary strata) and the surface trace (shown in yellow) of the reverse displacement Brush Creek Fault.  Fault nomenclature from map by Lindsey, D., Souliere, S., and Hafner, K., 1985, USGS Misc. Field Studies Map MF-1786.

Crinoid fossils from limestone bed of Sangre de Cristo Fm.

View from Upper Brush Lake towards NW, approximate trace of Brush Creek fault shown as orange dotted line.  Rocks east of fault are homiclinal sequence of uniformly moderately east dipping strata of the Penn-Perm Sangre de Cristo Fm.  Rocks to west are folded, locally overturned strata of Sangre de Cristo Fm and underlying Permian Minturn Fm.

Archaeogastropod fossils from limestone bed of Sangre de Cristo Fm.

View NE from headwaters of Brush Creek Lakes glacial valley.  Lakes developed on hummocky Pleistocene moraines, mapped as Pinedale till deposits by  Lindsey, D., Souliere, S., and Hafner, K., 1985, USGS Misc. Field Studies Map MF-1786. Crest of Pikes Peak barely visible in farthest background.

2018 March: Reviewing Precambrian geology of the Grand Canyon



View looking NE across Mineral Canyon towards inner gorge of Colorado River.

Same view as above, looking NE across Mineral Canyon towards inner gorge of Colorado River, with certain geologic features highlighted.  Lowest orange line is an  unconformity, where 1.75Ga Vishnu Schist is overlain by 1.1 to 1.2 Ga Unkar Group strata.  Yellow lines above unconformity mark contacts of a 1.05 Ga diabase dike that intrudes the strata, and where in contact with calcareous units, serpentinite zones have developed parallel to the contact, and are easily seen as the white bands along the diabase contacts.  The Hance Mines produced chrysotile asbestos from seams and veins developed within the serpentinite bands on the north side of the river. Green lines mark contacts within the Unkar group (Bass Limestone, Hakati Shale, Shinumo Quartzite from bottom to top in photo). Red line marks angular unconformity (the "Great Unconformity") between Cambrian Tapeats sandstone and the Unkar Group strata, representing a time gap of approximately 700 million years.  Solid red line shows onlap relationship of Tapeats onto the Unkar strata.  White line shows the orientation of the Tapeats strata.  Blue line marks a fault that affected Precambrian units but not the Paleozoic strata above, bracketing its age as between 1.07 Ga (diabase age) and 0.53 Ga (Tapeats age).

Detail of onlap relationship of Tapeats onto a paleo-topographic high of Unkar strata (yellow line). Lower photo credit: Ken Balleweg.



Looking North, Matthew J Gray and Ken Balleweg on Tonto Trail in Unkar Group strata, en route to Hance Rapids.  Note light colored serpentinite band at margin of diabase dike on north side of inner gorge. Mine dump of Hance Mine (chrysotile asbestos) partially visible at far left edge of photo.

Ken Balleweg, Matthew J Gray, and Matthew D Gray on Tonto Trail in Unkar Group strata, Sockdolager Rapids in background. Photo credit: K Balleweg.

2018 January: Published NI43-101 Technical report for the Camino Rojo gold deposit, Zacatecas, Mexico, for client Orla Mining Ltd.

Drill rig nearly hidden by desert brush at Camino Rojo Gold Project, Zacatecas, Mexico of Orla Mining.

2017 October: Checking erosional rates in Grand Canyon.

Distinctive silhouette of Angels Gate, capped by erosional remnants of Permian Coconino Sandstone, as seen from Grapevine Canyon.

Map check on the Tonto Platform (Cambrian Tapeats Sandstone).  Distinctive pyramidal shape of Vishnu Temple in background.  The peak is formed of remnant cap of Permian Kaibab limestone.  Precambrian Vishnu schist and strata of Precambrian Grand Canyon Supergroup visible in inner gorge below and right of Vishnu Temple peak, including the distinctive red-ochre Hakatai Shale. Photo credit: Ken Balleweg.

Matt Gray, Matthew J Gray, and Ken Balleweg in Tapeats walled slot canyon in Grapevine Canyon.



Matt Gray and Matthew J Gray enjoying lunch on Cambrian Tapeats sandstone with view into Vishnu Schist of Inner Gorge. View looking downriver (west).  Photo credit: Ken Balleweg.



2017:  August

Experiencing totality from the Late Archean Hartville Uplift, Wyoming

"The Diamond Ring" as seen during totality of solar eclipse, 21 August 2017, from the Hartville Uplift, Wyoming (photo: Ken Balleweg)

Sitting on Late Archean, 2.9 to 2.5Ga dolomite of the Wildcat Hills Formation, watching the approach of totality of during the solar eclipse, 21 August 2017, from the Hartville Uplift, Wyoming. L-R Frank Powell, Ken Balleweg, Matt Gray, Matthew J Gray, Kevin deKay, and Emelie deKay.   (photo: Ken Balleweg)

2017:  June

Working in the barrancas of the Sierra Madre, Mexico



2017:  May

Working in Central America



Resource Geosciences partners Matt Gray (left) and Mario Castellanos (right) and Senior Geologist Rodolfo Sauceda (center) assisting a client with an advanced project in Central America.

View towards distant drill site.

2017:  April

Continuing exploration and development drilling at the Commonwealth Project, Marlin Gold Inc., Cochise County Arizona.

Drilling to obtain metallurgical samples continues day and night at Pearce Hill, Dos Cabezas Mountains in background in daylight photo (photo credits Ken Balleweg).



2017 April:

Resource Geosciences presented a talk at the 2017 Discoveries Conference in Hermosillo, Sonora, discussing the discovery of the HS Zone at Marlin Gold's La Trinidad mine in Sinaloa, Mexico.

Discovery of the HS Zone, La Trinidad Mine, Sinaloa

2017 March: 

Resource Geosciences returned to the Grand Canyon. 

Ken Balleweg, Matthew J Gray, and Matt Gray on top of Redwall Limestone.  Photo credit: K Balleweg.

Without people blocking the view, note the Grand Canyon Supergroup strata in the inner gorge, atop the Vishnu Schist, in turn unconformably overlain by Cambrian Tapeats Sandstone. Photo credit:  K Balleweg.

The Mississipian Redwall limestone is a prominant cliff  former which is a dull grey limestone on freshly broken surfaces, but cliff faces are stained by iron oxides and red detritus from the overlying Supai Group strata.

View of inner gorge from ledge of Cambrian Tapeats Sandstone, at confluence of Grapvine Creek and Colorado River, above Grapevine Rapids. Note granitic pegmatites in Vishnu Shist in inner gorge. 

2017 February:

RGM presented a talk on orogenic gold in Mexico (Mexico's next big gold discovery?) at the Hermosillo Winter Event,The Mexico Roundup, in Hermosillo, Sonora, in February 2017.

"Mexico's Next Big Gold Discovery" (Orogenic Gold Deposits, Mexico" presented at the Hermosillo Winter Event, Mexican Roundup, February 2017

2017 February: 

In the field, Santa Rita Mountains, southern Arizona.

Contrary to the belief of many, it does snow in southern Arizona, and the sky island mountain ranges are often snow capped, as seen in this photo taken on the east side of Mt Wrightson in February 2017.



2017:  January

Brownfields exploration and development drilling at the Commonwealth Project, Marlin Gold Inc., Cochise County Arizona.

M Gray and four legged field assistant., San Ignacio target.

Sunrise at the drill rig, Pearce Hill, Commonwealth Au-Ag deposit.

2016 October:

Dr. Matthew Gray presented a talk on the status of gold exploration in Mexico at the 12th annual Seminario Internacion de Mineria Sonora.

"Gold Exploration in Mexico, Status Report 2016" presented at the 12th Seminario Internacional de Mineria Sonora, October 2016 AIMMGC A.C.

2016 October: 

Project evaluation in Alaska.

An easy commute

The view on the ride to work

2016 August:  In the field, Central America.

Resource Geosciences is assisting with resource development and exploration drill programs in Central America.  As seen in this photo, vegetation and topography makes outcrop mapping a challenge.

2016 August: 

In the field, Northern Canada.

Abandoned mine headframe

Remains of hoist house

What remains of the miners saloon - thousands of beer bottles.

2016 May: 

Resource Geosciences completed a 3 day, 2 night geologic excursion in Grand Canyon. Thanks to Ken Balleweg for trip photos.

 On top of Mississippian Redwall Limestone at Horseshoe Mesa.

West arm, Mississippian Redwall Limestone, Horseshoe Mesa.Walking on Cambrian Tapeats Sandstone, Tonto Platform.

Walking on Cambrian Tapeats Sandstone, Tonto Platform, with Mississippian Redwall Limestone cliff exposed in Cottonwood Creek canyon.Ken Balleweg, Matt Gray, Matthew J Gray, camped on top of Mississippian Redwall Limestone, Pennsylvanian Supai Group in background. ------------------------------------------------------------

2015:  Limestone quarry visit. Recognize this rock?  If you have seen the Empire State Building or the Pentagon then you've seen this limestone, which clads both iconic buildings. This is the Rooftop  quarry in the Mississippian Salem Limestone in Monroe County, Indiana.

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2015 July: Matt Gray examining high level alteration in a high sulfidation system (photo credit Ken Balleweg).

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2015 May:  Resource Geosciences "re-discovered" Carlin type gold deposits and the latest thoughts on thier genesis at the GSN Symposium in Reno.

Matt Gray of Resource Geosciences and fellow geologists in front of deformed Rodeo Creek strata at the Gold Quarry mine, during the GSN Symposium Carlin Deposits field trip.  Thanks to Jean Cline, Nancy Richter, and Kristen Benchley for organizing and running a great trip.

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2015 January:  Resource Geosciences begins the 2015 field season in the Great Basin, where unusually dry conditions allowed for field work in areas that typically are blanketed with snow.

Heading to the field during rush hour on Nevada highway.

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• 2014 October:  Matthew Gray presented "Silver Exploration in Mexico, Status Report 2014" at the 11th Seminario Internacional de Mineria Sonora 2014, AIMMGC A.C..
  

Matt Gray of Resource Geosciences presenting Silver Exploration in Mexico talk at 11th International Mining Seminar, Sonora 2014.

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• 2014 September:  Resource Geosciences attends SEG Keystone Symposium and Bingham Canyon field trip.  Thanks to Rio Tinto, and to Kim Schroeder, Kenneth  Krahulec, and Rudy Ganske for a great tour.

The SEG tour group in the Bingham Canyon pit.

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• 2014 May:  Matthew Gray presents "Programas QA QC de Barrenacion" (Drilling QA QC Programs) at the Cuarto Seminario Internacional de Perforación y Exploración Minera" en Hermosillo, Sonora.

Matt Gray recieving gift after conference presentation.

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• 2014 April:  NewGold kindly hosts us on a tour of the Mesquite Gold mine, California.

Javier Munguia (Timmins Gold), Daniel Maya (TG), Mario Castellanos (Resource Geosciences), Matt Gray (RG), Fernando Oviedo (RG), Lupe Navarro (TG), Roman Solis (TG)

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• 2014 February:  Resource Geosciences celebrates the 10th anniversary of Senior Accountant Alfonso Castañeda's employment with the company.

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