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Fossil coal: fire without flames - The Qilian Mountains have rich coal reserves, as first cited by Marco Polo.

Author: Michael Yamashita

©Michael Yamashita

Photo size: 12.6 Mpixels (36.2 MB uncompressed) - 4376x2889 pixels (14.6x9.6 in / 37.1x24.5 cm at 300 ppi)

Photo keywords: Marco Polo, China, Silk Road, Miners, underground, flashlight, occupational health and safety, workers, labor, mountains, Qilian, exploration, discovery, strength

Dangerous asbestos dust pollutes the air around a worker in Zhangye.

Fossil coal: fire without flames - The Qilian Mountains have rich coal reserves, as first cited by Marco Polo.

The Qilian Mountains have rich coal reserves, as first cited by Marco Polo.