Sorry peoples for my ignorance but can someone please clarify...

Sorry peoples for my ignorance but can someone please clarify for me if the resource begins at surface and extends to 1500m to 2000m or whether this is where the resource is. The statement on the website:


The Paradox Basin Potash Project (?Project?) covers approximately 390km2 in the Paradox Basin in south eastern Utah, USA. Transit has completed commitments to earn an initial 75% interest in the Project which comprises potash mineralisation in two beds of interest, Potash 13 and Potash 18, ranging in depth from approximately 1,500 to 2,000 metres below the surface.