DAQ-2024-005025

195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144820 • Salt Lake City, UT 84114-4820
Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov
Printed on 100% recycled paper
State of Utah

Department of
Environmental Quality

Kimberly D. Shelley
Executive Director

DIVISION OF AIR QUALITY
Bryce C. Bird
Director

SPENCER J. COX
Governor

DEIDRE HENDERSON
Lieutenant Governor
DAQC-088-24
Site ID 10571 (B1)

Brendan Murphy
Kennecott Utah Copper – Bingham Canyon Mine
4700 Daybreak Parkway
South Jordan, UT 84095

Dear Mr. Murphy:

Re: Kennecott Utah Copper – Bingham Canyon Mine – Fugitive Dust Control Plan (FDCP)
Review – Salt Lake County

The Fugitive Dust Control Plan for the Kennecott Utah Copper Bingham Canyon Mine dated
January 24, 2024, has been reviewed and found acceptable. This plan was submitted as part of
the Annual Road Dust Control Report; which requires a list of planned Dust Control Measures
for the next year.

If you have any questions, please call me at [phone] or email at [e-mail].

Sincerely,

Connor Kijowski, Environmental Scientist
Division of Air Quality

CG:CK:jl

cc: Salt Lake County Health Department
February 5, 2024
Rio Tinto Kennecott
4700 Daybreak Parkway
South Jordan, Utah 84009
January 24, 2024
Mr. Bryce Bird, Director
Utah Department of Environmental Quality
Division of Air Quality
P.O. Box 44820
Salt Lake City, UT 84114-4820
Attention: Mr. Conner Kijowski
Subject: Kennecott Utah Copper Bingham Canyon Mine
Approval Order DAQE-AN105710047-21
2023 Annual Road Dust Control Report
2024 Fugitive Dust Control Plan
Dear Mr. Bird:
As required by Condition II.B.3.a of the Bingham Canyon Mine Approval Order DAQE-
AN105710047-21, Kennecott Utah Copper LLC (KUC) submits the Bingham Canyon Mine
Annual Fugitive Dust Control Report for 2023 and the Fugitive Dust Control Plan for
2024.
If you have any questions or concerns please contact me or Sean Daly at 801-204-2563.
Sincerely,
Brendan Murphy
General Manager, Minerals
801-569-6200
Attachment (1)
Rio Tinto Kennecott Utah Copper, LLC. 4700 Daybreak Parkway, South Jordan, Utah 84009.
.
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KENNECOTT UTAH COPPER BINGHAM CANYON MINE
2023 ANNUAL ROAD DUST CONTROL REPORT
2024 FUGITIVE DUST CONTROL PLAN
1.0 Introduction
In compliance with Condition II.B.3.a of the Bingham Canyon Mine Approval Order DAQE-
AN105710047-21, the following report describes dust control measures completed in 2023 and those
planned for 2024.
2.0 Overview - 2023 Dust Control Measures and Permit Conditions
•Routine water spraying and/or chemical dust suppressant application on haula ge roads (governed
by weather, roadway moisture, and operating conditions) as required by Condition II.B.3.j.
•Wet drilling was performed for all blast holes, as required by Condition II.B.3.i.
•Chemical treatment of ancillary roads with a magnesium chloride dust suppressant.
•Per Condition II.B.3.j.A.1, KUC co ntinued application of road base material on active mine haul roads
within the pit influence boundary.
•Routine water spraying and vacuuming of roads around the C6/C 8 conveyor as well as the conveyor
road (governed by weather, roadway moisture , and operating conditions).
•Total material moved did not exceed 260,000,000 tons of ore and waste as required by Condition
II.B.1.e.A.
•Maximum daily total mileage for ore and waste haul trucks did not exceed 30,000 miles as required
by Condition II.B.1.e.C .
•Ore and waste haul truck fleet had a minimum design payload of 240 tons and a maximum of 6 wheels
each, as required by Condition II.B.1.e.D & E.
•Per Condition II.B.1.e.F , active mine waste dumps did not exceed a height of 1,000 feet.
•Per Condition II.B.3.j.B, KUC continued its use of the 5 mile-ore conveyor as its primary means of
transporting ore from the Mine to the Concentrator, thereby reducing fugitive emissions by displacing
transport by truck.
•KUC has integrated haul trucks of a higher capacity into the fleet , reducing vehicle miles travelled.
•All active haul roads at the Bingham Canyon Mine received at least two applications of dust
suppressant.
2.1 Water Applied to Roads in 202 3
A fleet of ten (10) pieces of equipment performed road watering activities including:
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• Eight (8) CAT 793 with specifically engineered road watering capabilities (52,000 -58,500 gallons/load)
• Two (2) Drill & Blast (D&B) water trucks
o One (1) 4,000 gallon capacity
o One (1) 3,600 gallon capacity

The large capacity water trucks provided dust suppression on the primary haul/access roads and the
smaller trucks spot-watered the narrow access roads and around shops, support facilities and blasting
activities. A fleet of smaller, rented water trucks were used throughout the year as needed.

The primary water filling stations for dust control are located at 6190, near underground operations
offices (5690), 6880 and SEW haul road. The total water volume applied, mainly by the large water
trucks on haul roads, in 2019 was estimated to be approximately 500,000,000 gallons.

The smaller water trucks are used around administrative and maintenance buildings, light vehicle access
roads as well as to supplement the large volume water trucks in the event they are temporarily out of
service. Smaller trucks also supply water to drills during the blasting process. Based upon previous annual
accounting estimates, it is assumed that these trucks have applied greater than 1,000,000 gallons per
year.

Road maintenance was accomplished with twelve (12) graders.

2.2 Conveyor Transfer Points
In 2023, a 4,000 gallon capacity water truck was used to perform watering of roads and wash down
around the conveyor transfer points outside the pit (C6/C8 transfer point). Depending upon seasonal
weather conditions, the truck is run to wet down areas along the belt line that are not paved. In addition,
the truck is used to wash down accumulated dust and sediment from underneath the C 6 and C8 belt and
corresponding transfer points.

A vacuum truck was utilized to assist along the conveyor system and at the transfer points to minimize
accumulation of materials underneath and along the conveyor system.
2.3 Chemical Dust Suppressant Applied in 202 3
Approximately 420,600 gallons of magnesium chloride and 17,000 gallons of Nalco Haulage DC
Surfactant were applied to the areas identified in the 2023 Fugitive Dust Control Plan. Active haul roads
outside of the Pit Influence Boundary (PIB) received at least two applications of chemic al dust
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suppressant in 2023, which is detailed in the attached map titled “Fugitive Dust Suppression Activities,
2023 Bingham Canyon Mine”

The applications were made with KUC equipment. The magnesium chloride solution was applied at an
average concentration of 30% magnesium chloride to roads that were prepared by grading and watering.
Surfactant was applied at 330 parts per million.

2.4 Asphalt Applied in 2023
During 202 3 repairs were made to access roads but no new areas were paved with asphalt.

2.5 Paved Access Roads and Parking Areas

A sweeper truck was hired to remove excess sediment from paved and/or concrete areas in proximity to
administrative and maintenance facilities as well as the paved access road beginning at Lark Gate and
leading to the Mine facilities. The service was performed frequently during the drier spring, summer and
fall months. In the winter months, the service was performed as conditions permitted.
A new parking lot was constructed near the mine entrance in 2012. Mine employ ees park their personal
vehicles and utilize buses for transport to the mine. This significantly decreases the amount of vehicles
travelling on the mine access road, which decreases the potential for fugitive dust generation.

2.6 Road Base Crusher

A portable road base crushing and screening unit has been permitted, tested and operating since October
2006 to crush road base material. Based on testing and application of the road base material, general road
quality and surfaces improved while reducing fine particulate matter. In 2023, 1,778,151 tons of material
were crushed for use on unpaved haul roads.

2.7 Haul Trucks/Conveyor/A -Frame

KUC continues to integrate haul trucks with a payload capacity of 320 tons. The integration of these
higher capacity trucks into the haulage fleet reduced fugitive emissions by requiring less vehicle miles
travelled.

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KUC continued use of its five mile conveyor system as its primary means of transporting crushed ore from
the mine to the concentrator. Ore material in the A-Frame was kept in accordance with the BCM
Approval Order DAQE-AN105710047-21.

3.0 Planned Dust Control Measures for 202 4
• Total material moved at the mine shall not exceed 260,000,000 tons of ore and waste under the
current AO.
• Active ore and waste haulage roads within the pit influence boundary shall be water sprayed
and/or treated with commercial dust suppressant as condit ions warrant.
• Maximum daily total mileage for ore and waste haul trucks shall not exceed 30,000 miles.
• Ore and waste haul truck fleet shall have a minimum design payload of 240 tons and a maximum
of 6 wheels each.
• Mine waste dumps to not exceed a height of 1,000 feet.
• Accessible areas of uncovered storage piles shall be sprayed with water or dust suppressants as
dry conditions warra nt and accessibility permits.
• Apply commercial dust suppressant as road conditions warrant to light duty and service vehicle
access roads.
• Apply commercial dust suppressant on active haul roads outside of the pit influence boundary
twice per year.
• KUC will continue its use of the 5 mile -ore conveyor as its primary means of transporting crushed
ore from the mine to the concentrator, thereby reducing fugitive emissions by displacing transport
by truck.
• KUC will continue integrating haul trucks of a higher ca pacity, reducing vehicle miles travelled.
• KUC will continue its use of a road base crusher to provide material for applicatio n on active ore
and waste haulage roads.
3.1 Unpaved Roads – Primary Ore and Waste Haulage
Dust control measures planned for 2024 include continued water application on haul roads as governed
by continual monitoring of road and meteorological (dry) conditions. The attached dust control plan map
titled “Fugitive Dust Suppression Activities, 2024 Bingham Canyon Mine” details these areas. Active haul
roads outside of the pit influence boundary (PIB) will all receive at a minimum two applications of
chemical dust suppressant in 2023. Watering will be concentrated on highly trafficked ore and waste haul
haulage roads between shovels and the in-pit crusher and the active waste rock dumps. The primary ore
and waste haulage roads depicted in attached drawing are based upon an aerial survey and are
approximate to the 2024 haul truck traffic patterns. All haul truck traffic patterns are subjec t to change as
ore faces and waste rock dumps progress throughout the year.

The planned road watering fleet consists of:
• Eight (8) CAT 793 with specifically engineered road watering capabilities (52,000 -58,500 gallons/load)
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• Two (2) Drill & Blast (D&B) water trucks
o One (1) 4,000 gallon capacity
o One (1) 3,600 gallon capacity

KUC has twelve (12) graders to perform road maintenance as well as other operational functions. The
number of graders used for road maintenance at any given time varies as road conditions warrant.
Experience has determined that rapid removal of mud slurry after a storm event eliminates a saturation
source for the road base and also helps to ultimately reduce fugitive emissions caused when the slurry
dries.

A portable road base crushing and screening unit has been permitted, tested and operating since October
2006 to crush road base material. Based on testing and application of the road base material, results
found general road quality and surfaces improved while reducing fine particul ate matter. KUC will
continue to operate the road base crushers in 2024.

3.2 Unpaved Roads –Light Duty and Service Vehicle s
Continued use of commercial dust suppression is planned in 2024 for unpaved roads that receive minimal
haul truck traffic and elevated light vehicle and service truck traffic. Application areas will be similar to
those areas that received magnesium chloride in 2023. Historically a 30% magnesium chloride and water
mixture has been used. The dust suppressant may be reapplied as needed to select areas throughout the
summer and fall. The light duty and service vehicle access roads will also utilize the same f leet of water
trucks described in section 3.1 as conditions warrant and access allows.

The crushing and conveying department will continue to water roads along the conveyor as conditions
warrant. The crushing and conveying department at the Copperton Concentrator purchased a 4,000
gallon capacity water truck in 2010 which is primarily dedicated to dust control measures associated with
the conveyor belt between the mine and the coarse ore stockpile.

3.3 Paved Roads and Areas
Haul trucks and most support vehicles are restricted to haul roads in the pit and on the waste rock dumps.
Haul trucks in particular do not travel on paved roads unless to access the upper pushback of the east cut
in which case the trucks briefly cross the Mine access road. Only support vehicles such as service vehicles
and light duty trucks regularly travel between paved and unpaved surfaces. In order to minimize dust
tracked onto internal paved roads, a parking lot was constructed near the mine entrance. Mine employees
park their personal vehicles and utilize buses for transport to the mine. This significantly decreases the
amount of vehicles travelling on the mine access road. Very few Kennecott company vehicles leave the
property and they must generally drive on four miles of paved road before reaching the front gate. There
is minimal opportunity for mud or dust to be tracked off property onto public roads. Pave d roads on the
property will be swept and vacuumed, bladed or washed on a routine basis similar to 2023 to minimize
fugitive dust.
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Paved areas along the C8 conveyor and around the A-frame stockpile will continue to be watered in 2024,
as conditions warrant. A vacuum truck will also be utilized in 2024 to assist along the conveyor system
and at the transfer points to minimize accumulation of materials underneath and along the conveyor
system.

3.4 Waste Rock Disposal Areas
Opacity surveys will be conducted monthly in an area where waste rock is being placed. The observation
shall be conducted in accordance with Condition II.B.3.g of the Bingham Canyon Mine Approval Order
(DAQE- AN105710047-21. Control measures such as dumping and pushing with dozers, or wetting with
water may be implemented in order to achieve compliance with Condition II.B.3.g.
3.5 Water Trucks

The Mine plans to operate a fleet of eight large capacity and two smaller capacity water trucks throughout
2024 and apply water as conditions wa rrant. The fleet will consist of eight (8) 55,000-58,500 gallon
capacity water trucks. The two Drill and Blast water trucks will be used to provide water to the drills,
wetting of drill patterns and watering of light vehicle access areas that are too narrow f or the large
capacity water trucks.

3.6 Supporting Activities

Water will be utilized t o minimize fugitive dust , as conditions warrant, from various supporting activities
that may occur at the Bingham Canyon Mine; including but not limited to, facility construction and
maintenance, yard area maintenance, equipment erection and water system work.

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