Tech Memo - KOP Viewshed Analysis 29Dec09 · 3.0 Viewshed Analysis Figures 2 and 3 show the location of the proposed KOPs while Figures 4 through 15 present the results of the Viewshed

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Tucson Office 3031 West Ina Road

Tucson, AZ 85741 Tel 520.297.7723 Fax 520.297.7724

www.tetratech.com

Technical Memorandum

To: Kathy Arnold From: Joel Carrasco; Francisco Barrios; Ashley Keepers

Company: Rosemont Copper Company Date: December 31, 2009

Re: Rosemont Copper Project

KOP Viewshed Analysis

Doc #: 237/09-320832-5.3

CC: David Krizek (Tetra Tech)

1.0 Introduction The following technical memorandum was prepared by Tetra Tech and presents a Viewshed Analysis based on the Key Observation Points (KOPs) associated with the proposed Rosemont Copper Project (Project).

The selected KOP locations were based on areas where Project operations and/or the final reclaimed features could possibly be viewed from State Route 83 (SR-83), from off-highway vehicle (OHV) trails and hiker trails, or from other prominent public access areas.

The Project is located on the east side of the Santa Rita Mountains, approximately 30 miles southeast of Tucson, Arizona and approximately 1.5 miles west of SR-83. Figure 1 provides a Project vicinity map.

2.0 KOP Locations A total of 12 proposed KOP locations were identified outside the perimeter of the Project site. Four (4) of the KOPs are co-located at a trailhead (TH) for either an OHV or hiker trail. The location of each KOP in relation to Project is shown on Figures 2 and 3. The location number, corresponding coordinates, and a brief location description of each KOP location are presented in Table 1.0.

To: Beverly Everson

Cc: Tom Furgason

From: Kathy

Doc #: 001 10 5.3.2

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Rot-iourcefut.

Memorandum RECEIVED JAN 07 2010

Subject: Transmittal of OP Viewshed Analysis

Date:

N Guam-be-F-97-2019_ AttA,OCV/L -1 1 .9-b

Rosemont Copper is pleased to transmit the Rosemont Copper Project KOP Viewshed Analysis, Tetra Tech dated December 31, 2009. We are transmitting three hard copies and two CDs of the report

directly to the Forest Service. We are also transmitting two hard copies of the report and one a CD to SWCA.

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Table 1.0 KOP Location Numbers, Coordinates, and Descriptions

Trailhead (TH) Information Coordinates1 KOP

Location Number

TH Location Number

TH Name Northing (feet)

Easting (feet)

Location Description

KOP-1 TH-1 Rosemont

OHV2 11561392.91 1734254.47 SR-833, Milepost (MP) 46.6 at entrance to South Helvetia Road (Road 231).

KOP-2 11560590 1732121

Approximately 0.35 miles southwest of SR-83 at the intersection of South Helvetia Road (Road 231) and the trailhead for the proposed portion of the Arizona Trail.

KOP-3 11571299 1741289 SR-83, near MP 44 and entrance to Road 4064.

KOP-4 TH-2 Arizona Trail 11546364 1730386 SR-83, MP 43 at entrance to Arizona

Trail.

KOP-5 11539874 1733585 SR 83, MP 41.6 at entrance to Singing Valley Ranch Road.

KOP-6 11543782 1726411 Approximately 1.5 miles northwest of the intersection of SR-83 and Singing Valley Ranch Road.

KOP-7 TH-3 Arizona Trail 11540301 1718930

Approximately 3 miles west-northwest of the intersection of SR-83 and Greaterville Road (Road 62); at the intersection of East Box Canyon Road (Road 62) and the Arizona Trail.

KOP-8 TH-4 Box

Canyon OHV

11542994 1715468

Approximately 3.7 miles west-northwest of the intersection of SR-83 and Greaterville Road (Road 62); and 375 feet northeast of the intersection of East Box Canyon Road (Road 62) and Helvetia Road (Road 231).

KOP-9 11549207 1715341

Approximately 4.2 miles northwest of the intersection of SR-83 and Greaterville Road (Road 62); and 150 feet northwest of the intersection of Helvetia Road (Road 231) and Road 4035.

KOP10 11561493 1714459 At Gunsight Pass, approximately 3.7 miles west of the intersection of SR 83 and Helvetia Road (Road 231).

KOP-11 115150061 1689071

Approximately 3 miles east-northeast of Road 70 on the Four Springs Trail (Trail 157) at the intersection of the Florida Canyon (Trail 145), Sawmill Canyon (Trail 146), and Cave Canyon (Trail 149) Trails.

KOP-12 11500112 1747385 Approximately 0.2 miles north of the Intersection of SR 82 and SR 83.

Explanation 1 Coordinates are presented in Universal Transverse Mercator (UTM), Zone 12. Datum: NAD 83. 2 OHV = Off-Highway Vehicle (i.e., 4WD/ATV/Motorcycle) 3 SR-83 = Scenic Road 83 (also known as the South Sonoita Highway)

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3.0 Viewshed Analysis Figures 2 and 3 show the location of the proposed KOPs while Figures 4 through 15 present the results of the Viewshed Analysis associated with each KOP. The analysis was performed assuming the viewer was at a standing height of approximately six (6) feet off the ground. The analysis was also performed with the final reclaimed Rosemont Ridge Landform (Landform) and the ultimate Open Pit configuration.

For each KOP, planned disturbance areas, as seen from each location, are highlighted in yellow (Figures 4 through 15). Additionally, undisturbed areas along the Santa Rita Mountain ridgeline are also highlighted within the general limits of the proposed project.

FIGURES

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Bullhead City

Globe

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Phoenix 4). Casa Grande, 111

Flagstaff

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T15S R18E T15S RISE T15S R14E

Sahuarita T17S R14E

T19S R15E T19S R18E

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Santa Cruz_County

T2OS R15E T2OS R16E

Pima County Tucson

T15S R17E T15S R16E

C)60.

T16S R16E „„Se T16S R17E T16S R18E T16S R14E T165 R15E

Rosemont Copper Project Location

T18S R14E 1185 RISE

Green Valley

T17S R17E 1-

CJi

T18S R17E

0

5 co

T18S R18E

T17S R18E

T18S R16E

T19S R17E

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T22S R16E T22S R17E 722S R18E

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T19S R14E

T2OS T14E

T21S R14E

T22S R14E

T17S R15E T17S R16E

T2OS R18E

T21S R15E

T22S R15E

PROJECT LOCATION MAP N.T.S.

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Figure No:

1

Revision

A

Date:

12/18/09

Figure Title

VIEVVSHED ANALYSIS VICINITY MAP

Project:

ROSEMONT COPPER PROJECT

Figure Title: Revision

A KEY OBSERVATION POINTS (KOPs) INDEX

Project:


Date:

12/18/09

Figure No:

2

Rosemont Facilities

Arizona Trail

Primary Trailhead with Parking

Trailhead with limited/No Parking

Key Observation Point

Legend

Rosemont Facilities

Arizona Trail




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KEY OBSERVATION POINTS (KOPs) MAIN FACILITY AREA

Project


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Date:

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Figure No:

4

Figure Title:

KEY OBSERVATION POINT 1 (MILEPOST 46.6)

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Legend

Rosemont Facilities

Arizona Trail




Visible Area from KOP (typ.)

Project:


Legend

Rosemont Facilities

Arizona Trail





0 1,000 2,000 Mimeo= Fee.

Figure Title:

KEY OBSERVATION POINT 2 (LOWER BARREL)

Project:


Date:

Revision

12/18/09

A Figure No:

5

Date:

12/18/09

Figure No:

6

Revision

A

Legend

Rosemont Facilities

Arizona Trail





O O

0 1,000 2,000 Fee

Figure Title:

KEY OBSERVATION POINT 3 (MILEPOST 44)

Project:


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Legend

Rosemont Facilities

Arizona Trail

O Primary Trailhead with Parking




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CD

Revision

A Date:

12/18/09

Figure No:

7

Figure Title:

KEY OBSERVATION POINT 4 (MILEPOST 43)

Project:


Rosemont Facilities

Arizona Trail





CONTOUR INTERVAL 40'

Figure Title:

KEY OBSERVATION POINT 5 (SINGING VALLEY RANCH ROAD)

Revision Date:

12/18/09

Project Figure No:

ROSEMONT COPPER PROJECT 8

TH

Arizona Trail





Date:

12/18/09

Figure No:

9

Revision

A

Legend Pilitavammo

12:01 , Rosemont Facilities

Figure Title:

KEY OBSERVATION POINT 6 (SINGING VALLEY RANCH ROAD)

Project


TH

O

Arizona Trail

TH Primary Trailhead with Parking




Legend

Rosemont Facilities

Figure Title:

KEY OBSERVATION POINT 7 (EAST BOX CANYON ROAD)

Project:


Date:

Revision

12/18/09

A

Figure No:

1 0

Legend

TH

Rosemont Facilities

Arizona Trail




Visible Area from KOP (typ.) O

Revision

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Figure Title:

KEY OBSERVATION POINT 8 (EAST BOX CANYON ROAD)

Project:


Date:

12/18/09

Figure No:

11

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Figure Title:

KEY OBSERVATION POINT 9 (NORTHEAST OF HELVETIA ROAD)

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Date: Revision

A 12/18/09

Project

Figure No

ROSEMONT COPPER PROJECT 12

Legend

Rosemont Facilities

Arizona Trail

TH Primary Trailhead with Parking



CID Visible Area from KOP (typ.)

Legend

Rosemont Facilities

TH

Arizona Trail

O Primary Trailhead with Parking



Visible Area from KOP (typ.) O

.41

Figure Title:

KEY OBSERVATION POINT 10 (GUNSIGHT PASS)

Date:

12/18/09

Project:


Figure No:

13

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Figure Title:

KEY OBSERVATION 11 (MT. WRIGHTSON - FOUR

SPRING TRAIL) Project:


Date:

Revision

12/18/09

A

Figure No:

14

Legend

Rosemont Facilities

Arizona Trail





TH

O

O

TH

Rosemont Facilities

Arizona Trail





Legend

2,000 4,000 8,000 Fee

Figure Title:

KEY OBSERVATION 12 (SONOITA CROSS ROAD)

Project


Date:

12/18/09

Figure No

15

Revision

A

Documents

Tech Memo - KOP Viewshed Analysis 29Dec09 · 3.0 Viewshed Analysis Figures 2 and 3 show the location of the proposed KOPs while Figures 4 through 15 present the results of the Viewshed