较低，更安全

Author: Miguel Menegusto, December 2016

Since the first colonisers arrived back in the 1500s, precious gold reserves have been explored in the dry lands of central and southeast Brasil. From pickaxes and manual classifiers to automatised extractors, with pressure washers and conveyor belts, the modern gold underground mining exploration has one more precious element to preserve:lives.

Miners are in constant risk with:

• Galleries kilometers deep underground
• 每日炸药爆炸
• Instable walls and tunnels

Story: The lower, the safer
Chapter 1: Introduction
Chapter 2:A risky survey
Chapter 3:激光扫描更安全，更快