Sandstone-hosted roll-front uranium deposits with potential for in-situ recovery


Project Highlights

  • enCore can acquire 100% interest in the 2,000 acre (809 ha) Property
  • Hosts a sandstone hosted uranium deposit discovered by Conoco Inc. in 1978
  • Located in the Grants Uranium District covering geological environments similar to Crownpoint

Property Overview

The Treeline Property consists of a mining lease and certain unpatented mining claims covering approximately 2,000 acres and is located approximately 115 miles west-northwest of Albuquerque, in McKinley and Cibola Counties, Grants Uranium District, New Mexico.

The property includes a sandstone-hosted uranium deposit discovered by Conoco Inc. in 1978.

enCore Energy Corp. has acquired a 100% interest in the Treeline Property.

Mineral Resources

enCore Energy Corp. has not done sufficient work to classify any of the historical estimates as current mineral resources or mineral reserves.

Geology and Mineralization

The Treeline Project lies on the Chaco Slope of the 100-mile wide San Juan Sedimentary Basin. The basin is filled with up to 15,000 feet of Paleozoic and Mesozoic sediments consisting predominantly of sandstone, siltstone and shale with minor limestone. The basin is asymmetric with the southern limb dipping gently to the north and the northern limb dipping steeply to the south.

Within the basin, the Jurassic Morrison Formation is the primary host for the uranium mineralization. The Morrison Formation is divided into three members. The lowest is the 255 foot thick Recapture Shale Member which is overlain by the 350 foot thick Westwater Member, which in turn is overlain by the 115 foot thick Brushy Basin Shale. The Westwater Member is the host to significant uranium mineralization. It is composed of a fine- to coarse-grained, poorly sorted, feldspathic sandstone with conglomeritic zones and minor discontinuous mudstone and shale units.

The sandstone units of the Westwater Member strike west-northwest and dip gently to the northeast. The units are generally oxidized updip and to the south of the mineralized zone and reduced downdip and to the north of the mineralized zone. The oxidized units are generally reddish-brown from the iron content, whereas the reduced units are generally green to grey due to the organic compounds, reduced iron compounds, or clay-chlorite assemblages.

Historical Exploration

An internal Conoco Inc. memorandum from 1978 on the Treeline Property outlined an historical mineral resource estimate of approximately 1.5 million pounds of U3O8 contained in 593,448 tons of sandstone at a grade of 0.13% U3O8. The mineralization, as defined by Conoco, is from historical data and is not classified consistent with CIM mineral resource reporting terminology and a qualified person has not done sufficient work to classify the historical estimate as a current mineral resource estimate.  enCore Energy Corp does not treat this historical estimate as a current mineral resource estimate, and the estimate should not be relied upon.

Mark C. Shutty, CPG, a Consultant to the Company, is the Qualified Person as defined under National Instrument 43-101 and has reviewed and verified the information presented above.