PITTSBURGH Asian Metal 4 Jan 12 – The Mexican iron ore market keeps sluggish as international prices remain unchanged for over a month. Shipments remains depressed as new regulations by the Mexican government stagnates movement and sales. Since October, two new policies have largely hindered sale from the port of Manzanillo. As the Federal government has aimed to crack down on illegal mining activities, the process of renewing export licenses has become increasingly meticulous and lengthy, delaying companies from sending shipments overseas. In an attempt to clean up the port, the local government shut down companies with mobile crushers placed at the port, forcing them to relocate. Mexican prices for iron ore fines 63%min keep at USD140-145t CFR China; no change since early December, 2011. Sources, however, have noted values from mines around the Manzanillo area dropping USD20.0-3...