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A line where a seam meets the surface.
Also known as: Seam basset line, Surface seam marking
The mining plan symbol marking where a coal or ore seam reaches the surface.
Marks where a coal or ore seam reaches the surface on a mining plan.
Contexts: Technical drawing, Maps
Is where mining historically began, so an outcrop line is often the oldest thing on a plan and the workings spread away from it in date order.
Contexts: Technical drawing, Maps
A line drawn across the plan following the ground where the seam meets the surface, often carrying a hatched edge.