Lehigh Cement to sue planning director over planning delays at site in California Written by Global Cement staff 04 March 2021 US: Germany-based HeidelbergCement subsidiary Lehigh Cement has taken legal action against the Santa Clara county planning and development director over processing delays to the company’s planning applications. The Los Altos Town Crier newspaper has reported that the producer plans to fill in an open-pit aggregates mine, to open a second mine and to cut through a natural ridge near to its integrated Permanente cement plant near Cupertino in California. The plans constitute an amendment to a plan previously approved in 2012 .