These are rough estimates, and there is a wide gap between the value of refined metal and the value of buried ore.

FORBES: The Promoter

These are very rough estimates, and in any event there is of course a wide gap between the value of refined metal and the value of buried ore.

FORBES: The Promoter

Sirius proposes to process the ore at a site at Wilton, near Middlesbrough, and plans to transport it via a steel pipeline buried a minimum of 3ft 11in (1.2 m) below ground.

BBC: Sirius propose North Yorks pipeline to transport potash