A sampling program will be conducted in a historic diamond-producing region of east-central Brazil to determine whether a structure on ground held by Spider Resources (SPA-A) is the primary source.
The company is set to begin sampling 60-70 sites over a 100-metre grid on its 162,000-ha Contendas property, which straddles Minas Gerais and Goias states. Spider has also commissioned a diamond recovery plant with a capacity of 10 tons per hour to process those samples, although its initial capacity will be only 10 tons per day
The company will test near-surface epiclastic material from structures it suspects are lamproite intrusions, several of which form the 130-ha Contendas structure.
The company is searching for the in situ source of numerous alluvial diamonds recovered over the years from the Paranaiba River and several of its tributaries. As recently as August, garimpeiros recovered a high-clarity, rare-white diamond weighing more than 350 carats from the Rio Verde River, 6 km from where it meets the Paranaiba River. Over the years, tributaries have yielded 49 diamonds weighing more than 50 carats, including one discovered in 1938 that weighed more than 725 carats.
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