How many mines and blasting qualifications does China have?

There are 36 China companies with first-class mining and blasting qualifications. According to incomplete statistics, there are more than 4,000 blasting companies in China, but only 36 enterprises have the first-class qualification of blasting demolition. The average annual operating income of each enterprise is less than 40 million, and the annual income of more than 500 million is even rarer. In recent 30 years, China's blasting technology and blasting engineering industry have developed rapidly. The annual consumption of explosives has exceeded 3 million tons, and the annual output value of blasting engineering industry is130 ~150 billion yuan. Many technologies have reached the advanced level in the world, and some technologies are still in the leading position.