Fact Sheet. Goldcorp Tailings Stewardship and Construction Methods. Background

Transcription

1 Fact Sheet Goldcorp Stewardship and Construction Methods Background are created as mined ore is processed into particles of fine sand through crushing, grinding and milling. Mined ore rock is moved to the milling circuit where the rock is reduced into sand and silt sized particles and then mixed with water and moved as slurry through the gold, silver and copper recovery process. The valuable minerals are separated from the rest of the milled rock particles either through physical or chemical recovery processes. After removing the valuable minerals, the remaining milled rock slurry, now referred to as tailings, is pumped or flows by gravity to an engineered impoundment area. Hollinger Management Area Stewardship Goldcorp s Stewardship Program was initiated in as part of our commitment to the safe and environmentally responsible development, operation and management of tailings storage facilities and to minimize risks by ensuring good practices are implemented at all Goldcorp tailings storage facilities and qualifying water dams. The program is based on regulatory requirements, incorporates industry best practices and Goldcorp s desire to be an industry leader in our sustainability practices. Construction Methods Upstream Upstream embankment construction begins with developing a starter dyke. The tailings are then discharged from the dam crest and form the foundation for future raises. The downstream dam toe remains fixed for the life of the facility and the dam centerline moves upstream. Figure 1 shows an overview of the construction stages. stewardship is designed to identify issues and concerns, manage liabilities, identify opportunities for operational efficiency, provide input into design, construction, operation and mine closure, educate operators, improve data management, provide a standardized review process, and prepare for upsets. stewardship applies to all tailings dams, and qualifying water dams defined as dams exceeding three (3) metres high or storing more than 100,000 m3 of liquid. Figure 1: Upstream construction method

2 Stewardship (continued) All active Goldcorp tailings dams and qualifying water dams have a Steward and an Engineer of Record (EoR), and all inactive tailings dams still storing water also have a Steward. All but one inactive tailings site also have EoRs, and the final site is being assigned an EoR in Dam Safety Inspections (DSI) are performed annually and separately by the Steward and by the EoR. Construction Methods Downstream Downstream dam construction begins with an impervious starter dyke and normally includes an internal drainage system as shown on Figure 2. The tailings are first deposited behind the dyke and the embankment is raised overtime. Both the dam centerline and downstream toe move further downstream with each subsequent raise. Each DSI group performs their reviews independently and publishes and submits separate reports. EoRs submit their reports to site, and Stewards submit their reports to Corporate. Dam Safety Reviews (DSR), a much more intensive effort, are performed every 5 years for all dams by the Stewards. Risk Assessments are updated annually supported by the Stewards and the EoRs for every dam. Summary reports are provided to each site and corrective actions are reviewed. Goldcorp recognizes tailings management as a significant issue shared by the company and the company s stakeholders. Goldcorp s aim is to manage tailings in a manner that effectively mitigates environmental, public health and safety, and community impacts while maintaining the long-term security of the tailings facility and sustainable land use options. The company assesses risks associated with tailings facilities (including physical and chemical risks), assesses alternatives to select site-appropriate technology and location for facilities, and applies good practices to manage those risks, such that tailings facilities are located, designed, constructed, operated and closed in a manner so that: facilities are managed commensurate with the risks they pose, with the objectives of preventing performance failures and meeting environmental requirements All solids and water are managed within designated areas that meet design intent All aspects of tailings management comply with regulatory requirements and conform to sound engineering practice, company standards, tailings management framework, and commitments to communities of interest including Indigenous groups. Figure 2: Downstream construction method Centerline The centerline method builds upon previous dam raises and only a portion of each raise is supported by tailings. Unlike the upstream method, the majority of dam fill is downstream of the tailings and the dam toe continues to progress downstream. The dam centerline remains fixed. The embankment is raised vertically and any internal drainage can be maintained as shown on Figure 3. Modified centerline is a combination of upstream and centerline methods and is done to reduce the volume of construction material that is required to be placed downstream from the embankment. at Cerro Negro Figure 3: Centerline construction method

3 Musselwhite RLGM - Red Lake Complex Ontario RLGM - Campbell Complex PGM - Dome No. 6 TMA Goldcorp (Active) Cerro Negro Santa Cruz, Argentina Peñasquito Zacatecas, México Company Site Name & Location Qualifying Dam Structure Type Raise Methodology Description North Dam dam Centerline Coarse tailings zone upstream and a downstream rock fill shell West Dam dam Centerline Coarse tailings zone upstream and a downstream rock fill shell South Dam dam Centerline Coarse tailings zone upstream and a downstream rock fill shell Max Dam Height (m) Most Recent DSI 90 August 2018 Fresh Water Storage Pond Water dam Geomembrane lined compacted clay fill, horse-shoe shaped dam August 2018 Most Recent DSR November November Nearest Downstream Town or receiving water Las Mesas Chile Colorado Pit EoR Golder Total Qualifying * Impoundments Dam 1 /water dam Downstream Zoned earthfill dam lined with bituminous geomembrane 38 October 2018 Dam 2 dam Downstream lined with bituminous geomembrane Dam 3 Seepage pond dam for Downstream lined with bituminous geomembrane 8 October 2018 dam 1 Dam 4 Seepage pond dam for Downstream lined with bituminous geomembrane 7 October 2018 dam 2 Pileta de Tratamiento de Aguas Water Ring dike shaped earthfill dam 8 October 2018 residuales Pileta Construccion Water Ring dike shaped earthfill dam with geomembrane liner 4 October 2018 Pileta 0 Pileta 1 Pileta 2 2 to 4 October 2018 Pileta 3 Pileta 4 Pileta Superior Pileta Inferior 4 to 8 October 2018 Pileta Emergencias Lodos E1 E2 2 to 10 October 2018 E3 E4 E5 North Dam Perimeter dam/water retaining Downstream Zoned earthfill dam with geomembrane barrier East Dam Perimeter dam Downstream with geomembrane barrier South Dam Perimeter dam Centerline transition to with geomembrane barrier downstream 33 June 2018 August South Dam Extension Perimeter dam Downstream with geomembrane barrier West Dam Perimeter dam Downstream with geomembrane barrier Separator Dyke Internal Structure South Dam /water dam Modified Centerline Coarse tailings zone upstream and a downstream zoned earth fill. West Dam /water dam Modified Centerline Coarse tailings zone upstream and a downstream zoned earth fill. North West Dam /water dam Centerline Zoned earth fill. September North Dam /water dam Modified Centerline Zoned earth fill June 2018 Settling/Polishing Pond Dykes Water/sedimentation dam Downstream Primary Clear Water Pond Water Secondary Clear Water Pond Water North Dam /water dam Modified Centerline Coarse tailings zone upstream and a downstream zoned earth fill. East End Dam /water dam Modified Centerline Coarse tailings zone upstream and a downstream zoned earth fill. Splitter Dyke 1 /water dam Downstream Zoned earthfill dam September Splitter Dyke 2 /water dam Downstream Zoned earthfill dam 15 June 2018 Primary Pond Dam /water dam Zoned earthfill dam Secondary Pond (North and South) /water dam Modified Centerline Coarse tailings zone upstream and a downstream zoned earth fill. Dam A Perimeter dam Centerline Zoned earthfill dam Dam B Perimeter dam Centerline Zoned earthfill dam Dam C Perimeter dam Centerline Zoned earthfill dam Dam D Perimeter dam Centerline Zoned earthfill dam 15 Dam E Perimeter dam Centerline Zoned earthfill dam Dam F Perimeter dam Centerline Zoned earthfill dam July 2018 October Dam G Perimeter dam Centerline Zoned earthfill dam Discharge Dykes dam Internal upstream within perimeter dams Permeter dams encircle tailings discharge dykes - internal compacted tailings sand lifts 10 Polishing Pond Dam Water dam Centerline Zoned earthfill dam 3 - Timmins - South Porcupine - Porcupine Lake - Balmertown - Red Lake, 6km south west - Balmertown - Red Lake, 6km south west - Opapimiskan Lake - Zeemel Lake - Lake 282 Stantec BGC AMEC AMEC Golder Total Grand Total (with inactive)

4 Cocheno ur Aunor A Pamour T3 McIntyre Goldcorp (Inactive) Dome 2A Ontario, Dome 2 Dome 1 Dona Lake Equity British Columbia, Broulan Reef Marlin San Marcos, Guatemala Company Site Name & Location Qualifying Dam Structure Type Raise Methodology Description Dam max Height (m) Most Recent DSI Most Recent DSR Nearest Downstream Town or receiving water TSF Main Dam /water dam Downstream Zoned earthfill dam TSF East Saddle Dam /water dam Downstream Zoned earthfill dam 82.5 Sediment Dyke 1 Downstream Rockfill dam 15 - San Jose Ixcaniche Stantec August 2018 July - Aldea Siete Platos Sediment Dyke 2 Downstream Rockfill dam 5 - Rio Cuilco Cochis Sediment Pond Downstream Rockfill dam 10 North Dam dam Butressed Upstream Coarse tailings East Dam dam Butressed Upstream Coarse tailings South Dam dam Butressed Upstream Coarse tailings 20 June Timmins KCB West Dam dam Butressed Upstream Coarse tailings Dam No. 1 /water dam Downstream transition to Coarse Taililngs/Earthfill + Coarse centerline 61 Dam No. 2 /water dam Centerline Earthfill/Coarse Taililngs - Houston August Lu Lake Dam No. 1 Seepage pond dam Water dam Downstream Rockfill dam KCB Diversion Dam /water dam Centerline Earthfill/Coarse Taililngs 38 EoR Total Qualifying Impoundments Dam C Water Centerline Earthfill/Coarse Taililngs Dyke 3 dam Upstream Coarse tailings 15 June 2018 February Pickle Lake KCB NW Starter Dam dam Upstream Coarse tailings North Dam dam Upstream Coarse tailings West Dam dam Upstream Coarse tailings South Dam dam Upstream Coarse tailings East Dam dam Upstream Coarse tailings 24 June 2018 June Timmins KCB 5 5 North dam Upstream Coarse tailings South dam Upstream Coarse tailings 21 June 2018 June Timmins KCB North dam Upstream Coarse tailings East dam Upstream Coarse tailings South dam Upstream Coarse tailings Dam 1 dam Upstream Coarse tailings ERG dam Dam 2 dam Upstream Coarse tailings Dam 3 dam Upstream Rock & Coarse tailings Dam 4 dam Dam 5 dam Upstream Coarse tailings Northwest Extension dam Upstream Coarse tailings North & Northwest Dam dam Upstream Coarse tailings West Dam dam Upstream Coarse tailings South Dam dam Upstream Coarse tailings East & Southeast Dam dam Upstream Coarse tailings Splitter Dyke dam Upstream Coarse tailings Perimeter Dam dam Upstream Coarse tailings Perimeter Dam dam Upstream Coarse tailings Perimeter Dam dam Upstream Coarse tailings Perimeter Dam dam Upstream Coarse tailings Dam #3 dam Centerline Earthfill/Coarse Taililngs South Dam dam Centerline Earthfill/Coarse Taililngs Dam #2 dam Earthfill/Coarse Taililngs North Dam dam Centerline Earthfill/Coarse Taililngs 21 June 2018 June Timmins KCB 3 3 June 2018 May Timmins - Porcupine River Golder June 2018 May Timmins KCB June Timmins Golder June Town of Cochenour - Red Lake Total

5 Cautionary Note Regarding Forward-Looking Statements This press release contains "forward-looking statements" within the meaning of Section 27A of the United States Securities Act of 1933, as amended, Section 21E of the United States Exchange Act of 1934, as amended, the United States Private Securities Litigation Reform Act of 1995, or in releases made by the United States Securities and Exchange Commission, all as may be amended from time to time, and "forward-looking information" under the provisions of applicable Canadian securities legislation, concerning the business, operations and financial performance and condition of Goldcorp. Forward-looking statements include, but are not limited to, statements relating to expected synergies and pre-tax Net Asset Value estimates of the Nevada Joint Venture; the potential for additional Tier One assets; the expected impact on the value of Newmont's planned acquisition of Goldcorp; the expected terms, timing and closing of the proposed transaction, including receipt of required approvals and satisfaction of other customary closing conditions; estimates of future production, including expected annual production range and reserve base; estimates of future capital expenditures; and expectations of future plans and benefits. Generally, these forward-looking statements can be identified by the use of words such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", "believes", or variations or comparable language of such words and phrases or statements that certain actions, events or results "may", "could", "would", "should", "might" or "will", "occur" or "be achieved" or the negative connotation thereof. Forward-looking statements are necessarily based upon a number of factors and assumptions that, if untrue, could cause the actual results, performances or achievements of Goldcorp to be materially different from future results, performances or achievements expressed or implied by such statements. Such statements and information are based on numerous assumptions regarding present and future business strategies and the environment in which Goldcorp will operate in the future, including the price of gold, anticipated costs and ability to achieve goals. Certain important factors that could cause actual results, performances or achievements to differ materially from those in the forward-looking statements include, among others, delays or failure to obtain the required approvals; competitive responses to the announcement of the transaction; litigation or challenges to the proposed transaction; changes to the current scientific and technical information; permitting, development, operations and expansion of Barrick's, Newmont's and Goldcorp's operations and projects being consistent with current expectations and mine plans, including without limitation receipt of export approvals; planning and integration assumptions; gold price volatility, discrepancies between actual and estimated production, mineral reserves and mineral resources and metallurgical recoveries, mining operational and development risks, litigation risks, regulatory restrictions (including environmental regulatory restrictions and liability), changes in national and local government legislation, taxation, controls or regulations and/or change in the administration of laws, policies and practices, expropriation or nationalization of property and political or economic developments in, the United States and other jurisdictions in which the Company does or may carry on business in the future, delays, suspension and technical challenges associated with capital projects, higher prices for fuel, steel, power, labour and other consumables, currency fluctuations, the speculative nature of gold exploration, the global economic climate, dilution, share price volatility, competition, loss of key employees, additional funding requirements and defective title to mineral claims or property. Although Goldcorp believes its expectations are based upon reasonable assumptions and has attempted to identify important factors that could cause actual actions, events or results to differ materially from those described in forward-looking statements, there may be other factors that cause actions, events or results not to be as anticipated, estimated or intended. Forward-looking statements are subject to known and unknown risks, uncertainties and other important factors that may cause the actual results, level of activity, performance or achievements of Goldcorp to be materially different from those expressed or implied by such forward-looking statements, including but not limited to: the inherent uncertainty associated with financial or other projections; the prompt and effective integration of Newmont's and Goldcorp's businesses; the ability to achieve the anticipated synergies and value-creation contemplated by the proposed transaction and the Nevada Joint Venture; the risk associated with Newmont's and Goldcorp's ability to obtain the approval of the proposed transaction by their shareholders required to consummate the proposed transaction and the timing of the closing of the proposed transaction, including the risk that the conditions to the transaction are not satisfied on a timely basis or at all and the failure of the transaction to close for any other reason; the risk that a consent or authorization that may be required for the proposed transaction is not obtained or is obtained subject to conditions that are not anticipated; the outcome of any legal proceedings that may be instituted against the parties and others related to the arrangement agreement; unanticipated difficulties or expenditures relating to the transaction, the response of business partners and retention as a result of the announcement and pendency of the transaction; risks relating to the value of the Newmont's common stock to be issued in connection with the transaction; the anticipated size of the markets and continued demand for Newmont's and Goldcorp's resources and the impact of competitive responses to the announcement of the transaction; and the diversion of management time on transaction-related issues as well as those factors discussed in the section entitled "Description of the Business Risk Factors" in Goldcorp's most recent annual information form available on SEDAR at and on EDGAR at Although Goldcorp has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Forward-looking statements are made as of the date hereof and, accordingly, are subject to change after such date. Except as otherwise indicated by Goldcorp, these statements do not reflect the potential impact of any non-recurring or other special items or of any disposition, monetization, merger, acquisition, other business combination or other transaction that may be announced or that may occur after the date hereof. Forward-looking statements are provided for the purpose of providing information about management's current expectations and plans and allowing investors and others to get a better understanding of Goldcorp's operating environment. Goldcorp does not intend or undertake to publicly update any forward-looking statements that are included in this document, whether as a result of new information, future events or otherwise, except in accordance with applicable securities laws.