Imerys Minerals California’s Lompoc Plant is located approximately one mile south of Lompoc and includes diatomaceous earth mining and processing facilities.  Diatomaceous earth is a sedimentary deposit composed of fossilized diatoms which had silicaceous skeletons.  Imerys mines, mills, and processes diatomite into powders of various grades for use by industries in many applications.  Imerys also operates a separate Celpure Plant within the Lompoc facility to produce specialized product and develop new products.

Operating Permits

Lompoc Plant Title V Operating Permit – Renewal Date of June 12, 2022

Draft Permits

The draft permit renewal was issued on March 28, 2024.  Comments are due by April 29, 2024.  See:  Draft Federal Part 70 Permit.

Public Notices

There current public notices for the draft permit:  Public Notice.