Colorado investigators blame "operator error" in deadly mine incident, not previously ...
The death of a tour guide at a Colorado mine tour in October was caused by "operator error," not mine practices or equipment ...
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Deadly elevator malfunction at Colorado gold mine deemed ‘operator error’ after inspection
October’s deadly elevator malfunction at a Colorado gold mine that trapped 23 people and killed one was caused by an “operator error,” according to a Wednesday Facebook post from the Teller ...