Calico Resources USA – Grassy Mountain

(last updated 12/19/2016)

1/14/16 Baseline Data Collection Completed

At its meeting on January 14, 2016, the TRT determined that collection of the baseline data under the approved methodologies was complete.

DOGAMI letter to Calico 1/20/16


8/03/15 Supplemental Environmental Data

On August 3, 2015, Calico Resources USA Corporation filed a supplemental baseline environmental data as a result of revising its Second Amended Notice of Intent. The Company has reviewed the initial Final, Revised Environmental Baseline Study Work Plans: low-resolution (19 MB PDF) | high resolution (106 MB PDF), approved by the State in March of 2013, and is providing some supplemental environmental data to add to previous reports. The mine is proposed to be located at Grassy Mountain, near Vale in Malheur County. A copy of the Supplemental Environmental Data is available here: low resolution (13 MB PDF) | high-resolution (31 MB PDF).

Public hearings are scheduled in Bend on August 26, 2015 and in Ontario on September 1, 2015. Public comments will be accepted until September 15th. Additional information on the public hearing and comment process is available in the Public Notice available here (24 KB PDF).


7/17/15 Second Amended Notice of Intent

Calico Resources has filed a Second Amended Notice of Intent. The Second Amended Notice of Intent addresses a change in the proposed location of processing facilities and the elimination of the associated haul road. Processing and tailing facilities will not be constructed on fee land situated three miles west of the deposit location. Processing, tailings disposal/management, and administration facilities are proposed to be relocated to unpatented lode mining and mill site claims on lands administered by the BLM.

Second Amended Notice of Intent (770 KB PDF)
Associated maps (945 KB PDF)


3/07/13 Final, Revised Baseline Study Plans Approved

Calico filed its final, revised baseline study plans for environmental, economic and cultural resources on 3/7/13. A copy of the PDF file, including study methodologies and study areas, is available here: low-resolution (19 MB) | high resolution (106 MB).

The Technical Review Team approved the proposed final, revised baseline study collection plans at its meeting 3/8/13. A copy of the final order approving the plans is available here.

Revisions to Baseline Study

As data have been collected in the field, adjustments have been made to the approved baseline study collection plans. The TRT has requested revisions or approved requested adjustments in the final, revised baseline environmental study collection plans as follows (most recent first):

  • Revise water resources monitoring and characterization (1/12/16) – DOGAMI letter to Calico
  • Revise air quality baseline study to remove 'elemental analysis' of particulate samples (4/17/15) – DOGAMI letter to Calico
  • Revise sampling preservation practices to ensure temperature sensitive samples arrive to the laboratory at recommended temperatures (3/25/14). DOGAMI letter to Calico
  • Revise nitrite/nitrate sampling methods; remove inorganic arsenic/retain total arsenic, revise avian use field collection form (8/8/13). DOGAMI letter to Calico
  • Add uranium to water quality parameters to be sampled (groundwater and surface water) (5/30/13). DOGAMI letter to Calico

6/11/12 Notice of Intent - Calico Resources USA – Grassy Mountain

Our agency has received a Notice of Intent from Calico Resources USA for a project to develop a gold extraction and processing mine in Malheur County, about 25 miles south/southwest of Vale, Oregon.  A copy of the Notice of Intent is posted here

The proposed Grassy Mountain Gold Project is located in Malheur County, Oregon located approximately 25 miles south-southwest of Vale, Oregon.  The project area includes patented and unpatented lode mining claims, as well as private land currently under lease for mineral exploration and development. Calico is considering constructing an underground mine and surface mill complex to develop the Grassy Mountain gold resource.

Information related to the application is posted below:


How to be Informed

  • US Mail
    To receive information regarding the project by US mail, send $5 to DOGAMI,  attn:  ReNeea Lofton, 229 Broadalbin St. SW, Albany, OR 97321.  The fee is to cover mailing costs.  This is a one-time fee per project.
  • Electronically
    To receive information regarding the project electronically, e-mail with your contact information.  Please insert “Grassy Mt list” in re:  line.  There is no fee to be kept informed electronically.

Information Availability
A copy of the Notice of Intent is available for review and copying at the DOGAMI offices in Albany (229 Broadalbin St. SW, Albany, OR   97321, Mon.–Fri. 8 am–5 pm) and at the DOGAMI offices in Portland – Nature of the NW (800 NE Oregon Street, Suite 965, Portland, OR  97232, Mon.–Fri. 9:00 am–12:30 pm; 1 pm–4 pm).   State agency offices are closed on state holidays and furlough days.  Photocopy charges may apply. 

A copy is also available at the Vale City Library (150 A Street, Vale) and the Ontario Community Library (388 S.W. 2nd Avenue, Ontario).  

Contact MLRR
Follow Us
Facebook   Twitter   Flickr   YouTube