I'm afraid there is nothing left of CMKX although you sometimes see people trading certificates for things at the store, especially around Christmas.
They get confused up here as they know a diamond mine is being developed in the same general area CMKX had mining-claims, and of course they don't have much education.
RIO's development is proceeding and will be for the next 7-10 years for a 100 year diamond mine. They shut down poor Urban before he and his shareholders saw the promised land.