APPARENT ESCAPE OF ACIDIC SOLUTION AT OWB-4 Elevated SO 4 is - - PowerPoint PPT Presentation

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APPARENT ESCAPE OF ACIDIC SOLUTION AT OWB-4 Elevated SO 4 is - - PowerPoint PPT Presentation

Mar 11, 2024 321 likes •714 views

SULFURIC ACID AT PTF H 2 SO 4 SO 4 MAKES IT SULFURIC H 2 MAKES IT ACID EC MEASURES SULFATE pH MEASURES ACIDITY INDIRECTLY FCI STARTS AT pH = -1.22 FCI STARTS AT 1.6 MILLION mg/l INDICATOR pH = 6.5 INDICATOR = 750

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SLIDE 1

SULFURIC ACID AT PTF

H2 SO4

  • H2 MAKES IT ACID
  • pH MEASURES ACIDITY
  • FCI STARTS AT pH = -1.22
  • INDICATOR pH = 6.5
  • SO4 MAKES IT SULFURIC
  • EC MEASURES SULFATE

INDIRECTLY

  • FCI STARTS AT 1.6 MILLION mg/l
  • INDICATOR = 750 mg/l

WILSON-1

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SLIDE 2

Elevated SO4 is evidence of H2 SO4 Drop in pH is evidence of H2 SO4

APPARENT ESCAPE OF ACIDIC SOLUTION AT OWB-4

WILSON-2

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SLIDE 3

WILSON’S POC’S DO NOT COST $1.75 MILLION

X – POC well per ADEQ guidance Would give maximum early warning Average direction of GW flow

Temp APP Vol. 2, Attach 12-Compliance with AWQS, Figure 12-1 Curis Response to ADEQ RFI, 9/21/2012, Figure 14A-37

x x x x x x x

POC-8

WILSON-3

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SLIDE 4

Brown Plate 79-2

WILSON-4

SPATIAL BIAS NEAR PTF

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SLIDE 5

“OUTSTANDING” CALIBRATION?

WILSON-5

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SLIDE 6

CALIBRATION WITHOUT AVERAGING

WILSON-6

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SLIDE 7

ASSUMPTIONS MATTER

MODEL-6

WILSON-7

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SLIDE 8

ADEQ SAYS NO NEUTRALIZATION AGENTS WILL BE USED

Responsiveness Summary, July 5, 2013, Page 100 of 332

WILSON-8

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SLIDE 9

POTENTIAL HEALTH EFFECTS based on Material Safety Data Sheets

Consideration Lemon Juice Sulfuric Acid Eye May cause irritation Severe burns, possibly irreversible Skin Low hazard Burns Ingested Low hazard Severe and permanent damage Inhaled Low hazard Severe irritation, burns, tissue damage Chronic None May cause death Exposure response Rinse, get medical attention if irritation develops Rinse, get medical aid immediately, CPR if breathing has ceased

WILSON-9

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SLIDE 10

BADCT: HYDRAULIC CONTROL AND RESTORATION Definition of Hydraulic Control in the application for a temporary permit (page xvi): Inward hydraulic gradient that prevents in-situ solutions from migrating beyond portion of

  • xide zone where injection and recovery of in-

situ solutions is occurring.

WILSON-10

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SLIDE 11

Section 3.4.4.2 BADCT GUIDANCE ON SHORT-CIRCUITS

[Exhibit Southwest Value Partners 156, page 3-41]

“Potential for short circuiting of anticipated solution migration pathways due to fractures and solution/rock chemical reactions over time is a potential concern that should be assessed for in-situ mining in most instances”.

WILSON-11

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SLIDE 12

MONITORING IN OBSERVATION WELLS (JULY, 2012)

HC-20

Email Request & Response- ADEQ (JW) to Curis (MN, DJ), 7/24/2012, pg. 3

WILSON-12

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SLIDE 13

NEW OBSERVATION WELLS

Add these wells 30gpm 30gpm 30gpm 30gpm 60gpm 60gpm 60gpm 60gpm

North West

WILSON-13

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SLIDE 14

CALCULATE AND REPORT H2 S04 BALANCE

H2 SO4 Injected H2 SO4 Extracted H2 SO4 consumed H2 SO4 in solution in ore body H2 SO4 not accounted for

WILSON-14

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SLIDE 15

72’ EXCLUSION ZONE IS MISLEADING (1)

Temp APP, Vol 1, Attachment 9, Exhibit 9A, Drawing 9A -1, March 1, 2012

40ft Exclusion Zone 32ft to top of screen

72ft

Fiber glass casing Steel casing Cement PVC screen Gravel & sand filter Cement Fiber glass to PVC coupling WILSON-15

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SLIDE 16

72’ EXCLUSION ZONE IS MISLEADING (2)

Temp APP, Vol 1, Attachment 9, Exhibit 9A, Drawing 9A -1, March 1, 2012

40ft Exclusion Zone 32ft to top of screen

72ft

Fiber glass casing Steel casing Cement PVC screen Gravel & sand filter Cement

Uppermost injection to gravel and sand filter

=

WILSON-16

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SLIDE 17

72’ EXCLUSION ZONE IS MISLEADING (3)

Temp APP, Vol 1, Attachment 9, Exhibit 9A, Drawing 9A -1, March 1, 2012

40ft Exclusion Zone 32ft to top of screen

72ft

Fiber glass casing Steel casing Cement Cement

Uppermost injection to Oxide Zone

=

Uppermost injection to gravel and sand filter

=

WILSON-17

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SLIDE 18

PMA “Pollutant Management Area”: ‘… the limit projected on the horizontal plane of the area on which pollutants are or will be placed” (A.R.S §49-244(1)). In other words, the land surface location that represents the source of the pollutant.

PMA PER STATUTE

PMA

Illustration taken from ADEQ public presentation on Hydrogeologic Requirements for APPs, given by Mason R. Bolitho, July 15, 2010

WILSON-18

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SLIDE 19

Limit of where pollutants may be placed

SIDE VIEW OF WHERE PTF MAY PLACE POLLUTANTS

WILSON-19

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SLIDE 20

PMA PER CURIS PERMIT

WILSON-20

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SLIDE 21

SIDE VIEW OF APPROVED PMA

Limit of where pollutants may be placed

WILSON-21

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SLIDE 22

PMA THAT CIRCUMSCRIBES DISCHARGING FACILITIES

WILSON-22

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SLIDE 23

HYDRAULIC CONTROL BARRIER DESIGNED WHERE 1 FOOT INWARD GRADIENT REQUIRED

= inward gradient

  • f 1 ft.

WILSON-23

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SLIDE 24

WILSON-24

APPROPRIATE LOCATIONS FOR COMPLIANCE WELLS

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SLIDE 25

TIMEFRAME FOR POC CAPTURE

WILSON-25

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SLIDE 26

RINSING FLOW SHEET

WILSON-26

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SLIDE 27

VERIFY ARSENIC MODEL USING BHP DATA

Produced from BHP Database, FlorenceDB.mdb

WILSON-27

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SLIDE 28

COMMITMENTS TO PROOF OF CONCEPT

  • Regulation R18-9-A210: may apply for a temporary permit for a

pilot project to “develop data for an APP application for the full- scale project.”

  • Curis Letter referring to deficiencies in full-scale application: “Pilot

test facility will allow for development of data to respond to ADEQ’s request for additional information dated September 7, 2011.”

  • Curis Application for Temporary Permit: has five purposes including

(2) develop data for the pending APP application for commercial– scale ISCR operations.

  • Temporary Permit: authorizes Curis to construct and operate a

production test facility which shall provide sufficient data to assess and develop a full-scale in-situ mining operation.

WILSON-28

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SLIDE 29

ADEQ’S ACTUAL POSITION ON PROOF OF CONCEPT

ADEQ Response page 189 of July 5, 2013 response document ADEQ believes there is sufficient monitoring in the permit to verify data assumptions, eliminate uncertainties and detect excursions of mining solutions. Quarterly PTF Operational and Monitoring Reports will be submitted in accordance with Section 2.7.4.4. ADEQ considers the data provided in the Quarterly Reports as a proof-of concept validation (PTF system performance, groundwater gradient information, groundwater sampling and monitoring well sampling data, etc.) throughout the PTF monitoring period, in addition to a PTF Summary Report required at the cessation of rinsing.

WILSON-29

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SLIDE 30

BIMODAL DISTRIBUTION OF HYDRAULIC CONDUCTIVITY

Golder Theim

WILSON-30

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SLIDE 31
  • A. 18 gpm injection produces mound > 100 feet high
  • B. 21 gpm injection produces mound < 30 feet high

A B

WILSON-31

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SLIDE 32

Importance of PTF heterogeneity (1) Well layout comparable to PTF layout

[PTF Observation and multi-level wells not shown] WILSON-32

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SLIDE 33

Importance of PTF heterogeneity (2) Enlargement of well layout comparable to PTF layout

WILSON-33

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SLIDE 34

Importance of PTF heterogeneity (3) Heterogeneity: short-circuits occur

Hydrogeological Studies For the In-Situ Leach Field Test at Florence, Arizona, pg. 24

CH-1 CH-2 BHP-13 BHP-4 BHP-1 BHP-2 BHP-3 BHP-5 BHP-10 BHP-12 OWB-4 BHP-9

“This feature indicates that there is a short circuit between BHP-5 and BHP-9. The wellfield is separated into two somehow isolated areas.”

WILSON-34

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SLIDE 35

Importance of PTF heterogeneity (4) Hypothetical short circuit at edge of commercial mine

SHORT CIRCUIT

WILSON-35

LOW CONDUCTIVITY ZONE

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SLIDE 36

Importance of PTF heterogeneity (5) Many possibilities for short-circuits to occur at edges of commercial project

WILSON-36

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SLIDE 37

Plume size varies with assumptions

WILSON-37

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SLIDE 38

WILSON-38

ARROWS BASED ON FLOW MODEL, NOT TRANSPORT

K=1 K=0.57 K=0.1