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FACT SHEET(Pursuant to Nevada Administrative Code (NAC) 445A.40 1)Permittee Name:Bullfrog Mines LLCProject Name:Bullfrog MinePermit Number:NEVOO8 023Review Type/Year/Revision:Renewal 2021, Revision 00A.Location and General DescriptionLocation: The Bullfrog Mine is located in Nye County, approximately 3 miles southwestof Beatty along Nevada State Highway 374. The Bullfrog Mine lies adjacent to LaddMountain and on the northern end of the Amargosa Desert, within Sections 9, 10, 11,14, 15, 16, 21, 22, 23, 26, 27, 28, 33, 34 and 35, Township 12 South (T12S), Range 46East (R46E); Sections 3 and 4, T13S, R46E, Mount Diablo Baseline and Meridian. Themine site is located on approximately 461 acres of private land and 55.5 acres on landsadministered by the U.S. Bureau of Land Management, Battle Mountain District,Tonopah field Office.General Description: This facility is in permanent closure. When operating, it consistedof three open pits and underground mining with ore processing by milling andconventional carbon-in-pulp technology (CIP). Precious metal recovery followingmilling was obtained by electrowinning. The facility was required to be designed,constructed, operated, and closed without any discharge or release of process fluids inexcess of the standards established in regulation except for meteorological events whichexceed the design storm event. This was a large-scale facility, processing in excess of2,500,000 tons of ore per year. The facility included an administrative office, warehouse,lab, two maintenance shops, three open pits, a crusher, CIP mill, CIP facilities, fourtailings ponds, two reclaim water collection ponds for the tailings facility, twoevaporation ponds, and two infiltration basins. Land disturbed during Barrick Bullfrogmining! milling operation totaled approximately 1,400 acres including haul and accessroads.B.SynopsisHistory: Mining in the area began in the early 1900s. The existing Bullfrog Mine beganoperations in July 1989 by Bond Gold. In June 1991, LAC Minerals Inc. purchased theproperty and underground mining was added to the Bullfrog Pit. Open pit operationsceased in 1997 and underground mining ended in December 1998. Milling andprocessing concluded on 11 November 1999. All beneficiation facilities were dismantledand removed by 15 December 2000. Banick Gold Corporation (BGC) had acquired themine in September 1994. BGC sold the property to Rocky Mountain Minerals Corp. in2020. In early 2021, the new Permittee requested that the Permit be transferred to itssubsidiary Bullfrog Mines LLC. Transfer documents, as required by NAC 445A.419,were received by the Division and the 2021 Renewal includes the new Permittee name.

Barrick Bullfrog Inc.Bullfrog MineNEV0088023 (Renewal 2021, Fact Sheet Revision 00)Page 2 of9Geology: The Bullfrog Mine is located within the Basin and Range Tectonic Province.The southern Bullfrog Hills are mainly composed of a thick sequence of Tertiaryvolcanic rocks erupted from several calderas near Timber Mountain to the east of theBullfrog Hills. North striking, west dipping normal faults have tilted and rotated much ofthe volcanic section to as much as 40-90 degrees in a series of east-facing blocks.Mineralization consists of a series of open spaced fissure veins, vein breccias, andstockworks of quartz and calcite with manganese oxides. The tailings facility is locatedsouth of Ladd Mountain and is underlain by alluvial basin deposits. These deposits ofsand and gravel are well graded and have a thickness of approximately 1,000 feet in thetailings area.Open Pits (3):Bonanza Mountain PitApproximate size is 1 acres and extends to a depth ofapproximately 400 feet below the adjacent topography. This pit is not free draining andthere are occasional accumulations of meteoric water occur.-Montgomery-Shoshone Pit Approximate size is 52 acres and extends to a depth ofapproximately 200 feet below the adjacent topography. The pit is not free draining butdoes not impound water.-Bullfrog Pit- Approximate size is 194 acres with depth of pit being 1,000 feet belowadjacent topography. Underground mining operations occurred in the high wall of thispit. This pit was partially backfilled in April 2000 to a predicted elevation to prevent a pitlake from forming. Subsequently, field measurements and groundwater modeling haveshown that the continued influx of groundwater into the pit has resulted in the formationof a pit lake. Material selected to use for additional backfill had been characterized andwas submitted with the 6 December 2013 pit lake update (“Design Criteria andConstruction Drawings Bullfrog Partial Pit Backfill”). This was the only pit thatintercepted the groundwater table. All pit lithologies were tested and determined topossess net neutralizing characteristics. During an 18 July 2016 meeting with the NevadaDivision of Environmental Protection (Division) and a subsequent amendment (17November 2016), the Permittee submitted an updated pit lake model justifying the levelof backfill for the Bullfrog Pit. The Permittee planned to add additional backfill,1,223,000 cubic yards, which would raise the pit floor approximately to 3,041 feetAMSL. Coarse-grained material from the west waste rock borrow source on thesouthwest corner of the pit was used to bring the bottom of the pit floor elevation up fromprevious models. An additional 3 feet of fine-grained material from the west fines alluvialbench borrow area on the southeast corner of the pit or fines from the east sideunderground fines backfill stockpile area, or both, was used. This work was concluded,and a record of construction document was approved by the Division on 8 January 2018.Visual inspections of the pits are conducted semi-annually. Other than occasionalephemeral ponded meteoric water, the pits have remained dry. See figure 1 formonitoring locations map.P:\BMRR\RegClos\Projects\Bullfrog Mine\PermitDocs\2021 RenewahNOD\2021 0324LK 00 8023 BullfrogjactSheet.docx

Barrick Bullfrog Inc.Bullfrog MineNEV0O 8023 (Renewal 2021, Fact Sheet Revision 00)Page 3 of 9Underground:There were four portals and four ventilation shafts. The portals were backfihled withwaste rock pushed into the declines from 50 feet behind the entrance to withinapproximately 15 feet from the portal entrance. The final 15 feet were sealed by pushingcemented backfill into place from floor to roof. The ventilation shafts were backfihledwith waste rock to the surface. Two feet of alluvial material was mounded over thebackfihled shafts to provide for vegetative cover.Waste Rock Storage Facilities (WRSFs, 7):There are seven WRSFs at the Bullfrog Mine. They are the Lower Bonanza, UpperBonanza, Lower Montgomery-Shoshone, Upper Montgomery-Shoshone, North, South,and West WRSFs. Waste rock removed from the pits consisted of oxidized, silicified andargillically altered volcaniclastic and lacustrine sediments and healed breccias. Acidgeneration potential from both the ore and waste rock was determined to be very lowwith a maximum pyrite content of 1-3% and a high neutralization potential based onacid-base accounting conducted on the rock samples. The remaining acres of disturbedground, including the WRSFs, have been or will be regraded and seeded during the finalclosure of the site.Tailings Storage Facility (TSF):The four cells of the Bullfrog TSF are located on private land and were constructed in anequal cell arrangement of approximately 90 acres each. All four cells were constructedwith synthetic liners. Cell 1 has a 40-mil polyethylene liner; Cells 2, 3, and 4 have a 60mu high-density polyethylene (HDPE) liner. A final lift of the embankment wasconstructed around Cells 1 and 2; the resulting facility is referred to as the Composite 12, which has been closed according to a plan submitted by Barrick Bullfrog Inc. (BBI) inNovember 1995. A final lift of the embankment was constructed around Cells 3 and 4;the resulting facility is referred to as the Composite 3-4. A two-part closure plan for Cells3-4, submitted 3 November 1999, has been implemented. An engineered cover consistingof topsoil and alluvial soils 12-14 inches thick overlying dewatered tailings wascompleted in 2000 (Part 1). This closure and reclamation included all but approximately30 acres of the TSF. The closure of the remaining 30 acres (Part 2) was completed inJanuary 2008. This work included the abandonment of 10 piezometers; installing a 12-14inch soil cover over the tailings material; construction of drainage swales; construction ofthe rip-rap lined spillway and stilling basin; removal of the abandoned inclined-decantstructure to a level below the tailings surface and the revegetation of the surface.In 2011 Golder Associates (Golder) produced a draindown study on behalf of BBI(“Lined Pond Closure Project, Updated Water Balance,” 20 July 2011). The reportpredicted a draindown rate of 2 gallons per minute (gpm) by 2015. The actual 2015draindown was approximately 10 gpm (see Table 1). The Golder model incorporatedlocal precipitation and evaporation rates as well as anticipated meteoric water for a 100year, 24-hour storm event (2.6 inches of precipitation). The model tracked predictedflows into the evaporation ponds from tailings Cell 1-4, pump flows from the reclaimponds prior to decommissioning and flows from direct precipitation.P:\BMRR\RegClos\Projects\Bullfrog Mine\PermitDocs\2021 Renewal\NOD\202 I 0324LK 0088023 Bullfrog factSheet docx

Barrick Bullfrog Inc.Bullfrog MineNEV0O 023 (Renewal 2021, fact Sheet Revision 00)Page 4 of 9Table 1: Bullfrog Mine Tailings Impoundment Average Draindown RateYear2006Draindown Rate (gpm)852010201518.51020207.4Table 2 below provides long-term water quality for parameters elevated or relevant tothis discussion. Draindown solution from the tailings impoundment is piped to thedischarge box at the evaporation cell.Table 2: Bullfrog Mine Tailings Impoundment Draindown Parameters of InterestParameter1995(a) Tailings Pond(mgJL)2020(b)Discharge Box(mg/L)Alkalinity, total (No DRV)t35825Arsenic (DRV: 0.0 10)0.020.141.90.880.020.100.0073 0.00047.70.249.78.90.027 0.0058901,2002,0462,6000.01 1Iron (DRV: 0.60)Manganese (DRV: 0.10)Mercury (DRV: 0.002)Nitrate Nitrite (as N) (DRV: 10)pH (SU) (DRV: 6.5 8.5)Selenium (DRV: 0.05)—Sulfate (DRV: 500)IDS (DRV: 1,000)WAD Cyanide (DRV: 0.2)()(a)(b)(c)(d)17Annual 1995 Monitoring Report.Fourth Quarter 2020 Monitoring Report.DRV Division Reference Value in mg/L, unless otherwise noted.SU Standard units.The sampling of the downgradient monitoring wells EW- 1 and MW-2 will continue asscheduled in the Permit as part of the verification of the integrity of the rog Mine\PermitDocs\2021 Renewal\NOD\202 I 0324LK 0088023 BullfrogjactSheet.docx

Barick Bullfrog Inc.Bullfrog MineNEV0088023 (Renewal 2021, Fact Sheet Revision 00)Page 5 of9pvr%Bullfrog Mine VOO88O23ELM\‘ tt% !LMELM1*.’ELM--.F’vrMontgomery-Shoshone Pit-ELMLower Montgomery-Shoshone WRSF‘Upper Montgomery6LMShoshone WRSFFYII.FYIELMDW4sELMNorthWRSFFYIELMBullfrog PitFYI—-West WRSFBMMW 30-95FYIReclaim Pond 34(Closed)Reclaim Pond 1-21.ELM.sDischarge Box7E-cell I.-—t—FYI—MW-A-E-Pond 2-E-cell 1 LDS.-.-BMMW 31-95NEW-1CCZSCSlull?12EUCC.3Figure 1: Site facilities and monitoring locations.P:\BMRR\RegClos\Projects\Sullfrog Mine\PentitDocs\2021 Renewal\NOD\202 10324LK 0088023 BullfrotFactSheet.docx