Between the 1880s to c1913, shale oil was mined and refined at Hartley Vale, placed into oil tanks, transported up the mountain incline, then onto a tramline to Hartley Vale Railway siding, from where it was then transferred to Sydney. Comet was the brand name of the kerosene which was produced from the shale. The western extent (top of the incline) was located one kilometre east, north east of Hartley Vale at an elevation of 900m. The eastern extent joined the Darling Causeway near the southern side of the intersection with Hartley Vale Road.

• Hartley and Mount Wilson

• 445 862 western end
• 456 855 eastern end