Highlights

  • Bayan completed six reverse-circulation holes totalling 856 metres at Desert Star in California.
  • Five of six holes returned intercepts exceeding 1,000ppm total rare earth oxides.
  • One interval in DS-001 returned 12.2 metres at 2,263ppm TREO from 16.8 metres.
  • Bayan plans to integrate drilling data, complete re-assays and rank remaining targets for follow-up work.

Bayan Mining and Minerals Ltd (ASX:BMM) has delivered its first subsurface confirmation of rare earth mineralisation at the Desert Star Project in California. Results from a six-hole maiden reverse-circulation campaign include multiple near-surface intersections above 1,000ppm total rare earth oxides, providing new geological information for the company’s next exploration decisions.

The Maiden Program in Numbers

Bayan drilled 856 metres across six reverse-circulation holes testing four locations on the 6.29km² Desert Star claim block. Five holes returned intervals grading above 1,000ppm total rare earth oxides, or TREO. In hole DS-001, drilling intersected 12.2 metres at 2,263ppm TREO from 16.8 metres, including three metres at 3,497ppm from 18.3 metres. Hole DS-006 returned 13.7 metres at 1,717ppm from 12.2 metres and a further three metres at 2,184ppm from 38.1 metres.

Another Hole Adds Geological Detail

DS-002 recorded several mineralised intervals, including 4.6 metres at 2,027ppm TREO from 64 metres, 10.7 metres at 1,607ppm from 74.7 metres and 9.1 metres at 1,032ppm from 96 metres. The hole ended in mineralisation, with its final 1.5-metre sample returning 1,146ppm TREO. These are individual assay intersections, not continuous resource grades, and follow-up work will be necessary to define the size and consistency of mineralisation.

Two Styles of Rare Earth Mineralisation

Initial interpretation points to rare earths associated with apatite in shonkinite dykes and with monazite and allanite in gneiss and felsic intrusive rocks. Those mineral associations remain subject to further mineralogical confirmation. Neodymium and praseodymium oxides, important magnet-related rare earth components, accounted for up to 20%–24% of TREO in the reported intercepts. The proportion provides a compositional insight but does not establish recoverability or project economics.

A Project Near an Established Rare Earth District

Desert Star lies approximately 4.5 kilometres northeast of the Mountain Pass rare earth mine in San Bernardino County. Its geological setting is a reason for exploration interest, but nearby production is not evidence that Desert Star has a comparable resource. The company also filed five additional claims near identified geochemical and geophysical anomalies. Six holes have covered only part of the target area, and deeper portions of a modelled geophysical anomaly remain untested.

What the Results Set Up Next

Bayan plans to combine drilling results with existing geophysical and surface data, complete a fusion re-assay program and rank remaining targets for possible further drilling. The first campaign establishes occurrences of rare earth mineralisation at tested locations. The next stage is to assess geological continuity and the distribution of mineralised zones before more advanced development questions can be addressed.