Byproduct Mercury from International Mining

Joseph PollaraChief Environmental EngineerNewmont Mining Corporation

July 24, 2007

Yanacocha Mine - Peru

Doré

Mine, load andhaul

Leaching Processingin CarbonColumns

Merrill-Croweprecipitation

Smelting

very simplified…

Dryprecipitate

Precipitateconditioning system

Electric arc furnace

Gas treatmentsystem

Slag (to treatment)Metal doré

Granulation and Milling

Intensive leachingreactor

Solution toprecipitation with

zinc

Residual to padWet precipitate

Retort

Mercuryrecovery

Gas treatmentsystem

SMELTING PROCESS

RETORT

GAS TREATMENT

MERCURY PRODUCTION AND SALES - 2006

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5,000

10,000

15,000

20,000

25,000

30,000

35,000

40,000 Ja

n

Feb

Mar Apr

May

Jun

Jul

Aug

Sep

Oct

Nov Dec

Physical Production kg Physical Production Cumm kgShipments kg In Inventory kg

YANACOCHA ELEMENTAL MERCURY PRODUCTION

Yanacocha - Elemental Hg Production (Metric Tonnes)

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10

20

30

40

50

60

70

2004 2005 2006

Met

ric T

onne

s

MERCURY TRANSPORTATION

• In 2005, began shipping to Bethlehem Apparatus (B.A.), Hellertown, Pennsylvania

• Rigorous mercury handling system– Mercury is deposited in metallic bottles of 34 kg capacity – Bottles display two certifications of quality

• one from the U.S. after manufacture• another one from Peru previous to filling

– Bottles are closed and security sealed– Bottles are loaded into a gasketed bottle carrier– The bottle carrier is sealed, certified and loaded– Transport occurs in 20’ container trucks– Each truck is equipped to transport 4 bottle carriers

• Use of a chemical marker to “fingerprint” Newmont’s mercury

SECURITY

• The convoy follows an established security route from the mine to the port of the Callao

• Personnel trained in hazardous material spill response escort the convoy in trucks fully equipped response

• A representative from Ministry of Energy and Mines accompanies

• Two security checkpoints enroute

• Receipt of shipment at the port and final security

• Stored in a secure, guarded warehouse until shipment

SUPPLY CHAIN

• Newmont has entered into contract with Bethlehem Apparatus to limit sales of mercury to “Qualified End Users”, which are:

– Users for manufacture of end products– U.S. and Australian markets only– No mercury resellers

MERCURY BOTTLES

PREPARATION OF BOTTLE CARRIERS

SEALING THE BOTTLE CARRIER

OVERWRAPPING AND LABELING

LOADING THE BOTTLE CARRIERS