Mexico City ( CNN ) -- Rescuers overnight recovered four bodies from a coal mine in northern Mexico that suffered an explosion last week , making a total of 11 bodies that have been extracted so far , the country 's labor secretary said Saturday . Javier Lozano says at this point -- more than four days after the blast -- there is no hope of finding alive the remaining miners trapped inside . Three more miners remain inside the shaft . The mine had been operating for only 20 days and had 25 workers who were not unionized , Lozano said . He described such small , makeshift coal mines as `` unsafe places , '' calling them `` irregular , deadly traps , as we are seeing . '' The owner of the mine is a company known as Binsa , the statement from the attorney general 's office said . The mine contains a shaft that is 60 meters ( 197 feet ) deep , Sabinas Mayor Jesus Montemayor Garza said . Sabinas is in the coal production center of Mexico and has a museum dedicated to the history of coal mining . Several chapters of that history , however , have been tragic . In 2006 , in the nearby town of San Juan de Sabinas , 65 miners perished after an explosion in the mine where they were working . Explosive gas inside the mine hindered the rescue of the miners at the Pasta de Conchos mine , which the government eventually abandoned . An organization representing family members of the victims of that accident said Tuesday 's blast was a tragic reminder that the federal government must do more to regulate mines . One activist from the organization said there had been more than 40 people killed in local coal mines since the 2006 accident . `` How long will it take to recognize that there is a very serious crisis in coal mining ( in the Mexican state of ) Coahuila , in which the workers and their families are those who must endure the worst , with dead , widows and orphans ? '' a statement from the organization said .
Eleven bodies have been recovered and authorities are looking for three more . He says they are close to reaching those . He says there is no hope of finding the others alive .