According to the company, that has six underground mines in operation in Colombia, no employees or contractors were injured.
Gran Colombia said it is evaluating the extent of the damage and the effect it will have on the drilling program underway at the property.
The miner said Mazamorras is not a producing property and the damage has not affected production at its Segovia or Marmato properties.
The Toronto-based company’s shares closed at 68 Canadian cents on Tuesday on the Toronto Stock Exchange.