Though the government has taken several measures to check illegal mining of sand and gravel in different parts of the state, stopping it completely is a challenge.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/despite-statements-challans-illegal-mining-goes-unabated
[2] http://admin.indiaenvironmentportal.org.in/category/author/dharam-prakash-gupta
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/tribune-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/himachal-pradesh
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mining
[6] http://admin.indiaenvironmentportal.org.in/thesaurus/sand-mining
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rivers
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/illegal-trade
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/building-materials