( CNN ) -- Who 's to blame for the mine collapse that trapped 33 workers underground for months in Chile ? No one , according to prosecutors , who closed the case Thursday after a lengthy investigation . Nearly three years after the collapse at the San Jose mine in Copiapo , Chile , prosecutors said , there 's not enough evidence to file criminal charges . The 2010 mining accident drew global attention as word spread that the workers had survived and rescuers worked for weeks to free them . For 17 days after the collapse , nobody knew if they were alive . The miners spent 69 days underground before they were rescued . `` This was a complicated case , which is why it took us so long to make this determination , '' regional prosecutor Hector Mella Farias said . `` And I want to be clear in saying that everything to collect evidence that the law allows was done . '' Authorities investigated the case for years , he said , compiling expert analysis and testimonies that totaled more than 20,000 pages . Two outraged miners told CNN Chile late Thursday that they plan to appeal the regional prosecutor 's decision . The owners of the mine should be held responsible in a criminal case , they said , alleging that the company knew there was a risk of collapse and did n't do enough to protect workers . The miners have also filed a negligence lawsuit against the government , accusing the agency that oversees mining of failing to ensure safety measures . `` Today we heard the decision , as did many of our colleagues , and many of them are extremely shocked , '' said Luis Urzua , the miners ' shift boss and the last man rescued from the mine . `` Because this is something that places responsibility upon the mine owners , because they are the entity that must supervise what happens . As supervisors , they should have prevented it . They should have known what sectors were at risk of collapsing . '' The miners want future accidents to be prevented , he said , and they want the mine 's owners to be held accountable . `` We want for this never to happen again , '' he said . `` What happened to us was not a work of nature . This was done by a man , by the negligence of man . '' Attorneys for the mine 's owners told CNN Chile on Thursday that the prosecutor 's decision indicated that natural causes sparked the accident , and the company 's owners are not responsible . `` This decision was n't made on a whim , '' said attorney Catherine Lathrop . `` It is part of a long investigative process . '' Miner Juan Carlos Aguilar said the miners are n't looking for money , but they do want justice . And comments like Lathrop 's , he said , show that they have n't gotten that yet . `` She is laughing at what happened to us , '' he said . `` I think any miner is going to feel the same way . If they did nothing for us , when we were trapped for 70 days 700 meters underground , what is going to happen when there 's another incident ? ... Any person can do anything in Chile , and there is no justice . '' CNN 's Samuel Santamaria and Rafael Romo contributed to this report .
A regional prosecutor says there is n't enough evidence to bring charges . Outraged miners say they 'll appeal the decision . An attorney for the mine 's owners says the company is not responsible . Miner : ` ` This was done ... by the negligence of ... ''