2014-03-21_REVISION - M1977361

• Permit No: M1977361
• IBM Index Class Name: REVISION
• Doc Date: 3/21/2014
• Doc Name: Permit Application AM01
• From: CEMEX
• To: DRMS
• Media Type: D
• Archive: No

Permit Amendment — Cemex Sandstone Quarry
Cemex Sandstone Quarry
Permit M- 1977 -361
Section 1 — Introduction
1.0 Introduction & Background
The Cemex Sandstone Quarry has been previously permitted under the name Cemex Silica Quarry, but
will be hereafter referred to as the Cemex Sandstone Quarry (Sandstone Quarry). The Sandstone Quarry
is an active silica sandstone mining operation wholly owned and operated by Cemex, Inc. (Cemex). The
Sandstone Quarry is located % mile southeast of Lyons, Colorado in Boulder County.
The existing permit, Mining and Reclamation Permit (M- 1977 -361), is a Limited Impact (110) Mining and
Reclamation Permit that was initially approved by the Colorado Mined Land Reclamation Board (Board) in
September 1978 after passage of the Colorado Mined Land Reclamation Act (CMLRA). With this
application, Cemex seeks to amend this permit to update the mining and reclamation plans, clarify the
affected land boundary, and update the post- mining land use. The requested permit amendment will not
alter the affected land boundary nor does it represent an expansion of planned mining operations or
facilities.
The sandstone that is mined from the Sandstone Quarry is a small, but critical, component of the cement
products that Cemex produces at the nearby Lyons Cement Plant. Over the next 10 years, approximately
220,000 tons of sandstone will be mined from the Sandstone Quarry to complement the anticipated
production of the Cemex Dowe Flats Quarry where the Lyons Cement Plant's limestone is mined. At the
end of this period, the Sandstone Quarry will be reclaimed per the Reclamation Plan included in this permit
amendment application (Exhibit D). The existing permit designates agriculture (rangeland) as the post -
mining land use; however, this designation will be changed to wildlife habitat to better align with the land
use on adjacent properties.
1.1 Purpose of Permit Amendment
This permit amendment will provide updated information based on the current status of planning and
engineering activities. The existing permit was initially approved by the Board in September 1978 and has
been modified by one technical revision (TR1) approved in January 1998. The specific purpose of this
permit amendment is threefold:
1. The affected land boundary will be clarified.
2. The post- mining land use will be updated from Agriculture /Rangeland to Wildlife Habitat.
3. The Mining Plan and Reclamation Plan will be updated to reflect current practices and technologies
and a life -of -mine strategy for mining and reclamation not specified in the original 1977 permit
application.
All Exhibits included in the existing permit have been reviewed and updated as necessary as specified in
Rule 6.3 to meet the requirements of a Limited Impact (110) Mining and Reclamation Permit and reflect
current conditions and planned mining and reclamation activities. These updates include new Mining
(Exhibit C) and Reclamation Plans (Exhibit D) and a Geotechnical Stability Assessment (Exhibit 6.5) based
on the current plans for the mine.
1.1.1 Affected Land Boundary Clarification
This permit amendment will seek to clarify the current affected lands boundary with no change in the total
affected area of 9.99 acres. This clarified affected lands boundary will encompass all planned mining and
reclamation activities and will be surveyed and marked on the ground to avoid any future confusion.
There were no georeferenced maps included in the original permit application approved in 1978 and while
maps were included in the 1998 TR1, the boundaries on these maps were hand -drawn and still difficult to
pin -point on the ground. In reviewing the various permitting, inspection, and report documents pertaining to
this permit in the DRMS files, there have been multiple instances over the past several decades on both
Introduction 1 March 2014