Searchlight Minerals Corp. · OTC:SRCH
Searchlight Minerals — Investor Presentation (June 2018)
42 slides from Searchlight Minerals's investor presentation, Jun 22, 2018
Slide 1: Clarkdale Copper Tailings Project
Searchlight Minerals Corp. Clarkdale Copper Tailings Project June 18, 2018
Slide 2: Forward Looking Statements
2 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 2 Forward Looking Statements This presentation may contain, in addition to historical information, forward - looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of t
Slide 3: The Clarkdale Slag Project: Overview
3 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 3 • In this presentation, we will cover the following topics: 1. History and overview of the Clarkdale smelter site. 2. Results of Process Development Test Work To - date. 3. Summary and Conclusions of Test Work 4. Economic I
Slide 4: Unique reclamation project overview
4 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 4 • A unique reclamation project to recover precious and base metals from the reprocessing of slag produced from the smelting of copper ore mined at the United Verde Copper Mine in Jerome, Arizona. • The historic "Billion Dol
Slide 5: Location
5 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 5 • The project is located outside the town of Clarkdale, Arizona, which is approx. 100 miles north of Phoenix, and is situated on 800+ acres of industrial zoned land. Clarkdale itself is a modest - sized town of some 8,000 r
Slide 6: Smelter Operated from 1915 to 1952
6 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 6 The Clarkdale Slag Project: Smelter Operated from 1915 to 1952
Slide 7: Aerial Photo of Project Site
7 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 7 The Clarkdale Slag Project Aerial Photo of Project Site
Slide 8: Overview: Ore and Smelting Process
8 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 8 The Clarkdale Slag Project: Overview • The massive sulfide copper ore (approximately 3.3% Cu) was mined at the town of Jerome a few miles away and hauled by train to the smelter at Clarkdale. • The ore was crushed and groun
Slide 9: Overview: Slag Deposition
9 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 9 The Clarkdale Slag Project: Overview • The non - copper molten waste material (slag), which was decanted off the top of molten copper was taken to the slag pile and dumped onto the pile where it would flow out in a molten l
Slide 10: Mineral Estimate
10 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 10 The Clarkdale Slag Project: Mineral Estimate • In 2005, Mountain States R&D International (MSRDI) was retained by SMC to conduct a drilling, sampling and analysis program on the slag deposit under standard "chain of custo
Slide 11: Technical Consultants
11 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 11 • Arrakis, Inc./James Murray Jim is our Project Manager for the Clarkdale Metals Project. He has over 38 years of experience in mining and process engineering, project management, mine and process plant design, constructi
Slide 12: Technical Consultants
12 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 12 The Clarkdale Slag Project: Technical Consultants Richard Kunter patent sited on Barrick POX and thiosulfate leach patent.
Slide 13: Project History
13 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 13 The Clarkdale Slag Project: Project History • Initial work done by Dr. Ager using SEM/TEM showed that the gold contained in the copper slag was of nano - dimensional scale and coated with a highly refractory silicate with
Slide 14: Conceptual Process Flow Diagram for Pilot Run
14 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 14 Conceptual Process Flow Diagram: For Pilot Run In 2010 Crushing Grinding Leaching Filtration Metals In Solution Resin Extraction Cu Solvent Extraction Gold (Au) Silver (Ag) Electrowin Copper (Cu) Zn Solvent Extraction Ele
Slide 15: Operation of Test Module: Slag Wear Issues
15 • The extremely hard and abrasive iron silicate slag material demonstrated its ability to destroy and abrade even the most hardened and wear resistant steels. This resulted in: 1. Excessive wear to the primary jaw crusher, resulting in feed not meeting design specifications (“off - spec feed”) to
Slide 16: Vibratory Mill Scaling Problems
16 • Unfortunately, the large Vibratory Mill did not scale to a commercial size due to the unanticipated slower frequency of the smaller Vibratory Mill used in pre - feasibility testing. The net result is, the required particle grind size had to be reduced and the design throughput of the larger mil
Slide 17: Operation of Test Module Improvements
17 • From 2009 to the summer of 2010 when a semi - continuous run was conducted several improvements to the Test Module were implemented to improve the efficiency and safety of the Test Module. The Test Module is shown in its current configuration in the lower right. Process/plant changes which were
Slide 18: Technical Challenges in 2010
18 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 18 The Clarkdale Slag Project: Technical Challenges in 2010 • As we increased the amount of slag in the crushing and grinding circuit, we experienced difficulties in grinding the slag material into a fine enough material to
Slide 19: Operation of Test Module: Leach and SX Issues
19 • Because of the difficulties caused by grinding in the Test Module and the resultant need for more severe chemistry to overcome the off - spec grind, a great deal of iron (up to 35,000 ppm) and silica (up to 7,500 ppm) was dissolved and remained in the same PLS (Pregnant Leach Solution) as the d
Slide 20: Operation of Test Module / Lessons Learned
20 The Clarkdale Slag Project: Operation of Test Module / Lessons Learned • Our data from the operation of the Test Module indicated that with proper grinding, a simple halide leach could dissolve the precious and base metals from the slag into the pregnant leach solution (PLS) in sufficient quantit
Slide 21: Lessons Learned: High Pressure Grinding Rolls
21 • Based on the demonstration that the chosen crushing and grinding system would either not endure the hardness and abrasiveness of the slag or was not of sufficient capacity to scale up to commercial size, alternative crushing/grinding systems were sought. • High Pressure Grinding Rolls (HPGR) we
Slide 22: HPGR Micro-fracturing of Slag
22 • HPGR grinding systems impart extremely high compression energy in the space between the rolls followed by immediate release of that compression energy in tension. This results in micro - fracturing of the slag material. • Micro - fractures enhance the ability of the leach solution to access the
Slide 23: Lessons Learned: Alternative Leaching and POX
23 The Clarkdale Slag Project: Operation of Test Module / Lessons Learned • Due to the aforementioned problems, alternatives to the ambient leach used in the pilot test run, were examined. Alternate leach reagents and concentrations as well as separate staged leaches using different reagents were ex
Slide 24: Autoclave Proposed Process Flow Diagram (POX)
24 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 24 The Clarkdale Slag Project: Autoclave Proposed Process Flow Diagram (POX) Crushing / Grinding Clean Slag Leaching Filtration Metals In Solution Resin Extraction Cu Solvent Extraction Gold (Au) Silver (Ag) Electrowin Coppe
Slide 25: Autoclave Testing Methods & Results
25 • One of the alternate leaching methods examined was the use of a moderate temperature / pressure mineral processing autoclave. Specifically the method examined was POX (Pressure Oxidation) to oxidize and stabilize iron and silica, followed by an ambient temperature/pressure leach of the pre - tr
Slide 26: The Autoclave Process
26 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 26 The Clarkdale Slag Project: The Autoclave Process • Initial bench scale POX tests were conducted at Arrakis in Denver at a variety of temperatures and pressures. • The values obtained ranged from 0.05 opt to 0.10 opt Au m
Slide 27: POX Test Results from SGS Chile
27 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 27 The Clarkdale Slag Project: The Autoclave Process POX Test Results from SGS Chile report (using Arrakis modified assay procedure)
Slide 28: POL Test Results from SGS Chile
28 Searchlight Minerals Corp. | Annual Shareholders Meeting | December 2009 28 The Clarkdale Slag Project: The Autoclave Process POL Test Results from SGS Chile report (using Arrakis modified assay procedure)
Slide 29: Bench Scale POX Autoclave Tests
29 • In addition to the 16 POX tests run at SGS Chile, Arrakis has run over 75 separate POX autoclave tests using 0.5 kg slag samples have been run with subsequent leaching of the residues. Operating temperatures have been varied from 140 o C to 220 o C in varying concentration of sulfuric acid solu
Slide 30: Australian Firm Autoclave Test Flow Diagram
30 The Clarkdale Slag Project: Autoclave Testing Methods & Results Australian Firm Autoclave Test Flow Diagram
Slide 31: Australian Firm Compartment Autoclave
31 The Clarkdale Slag Project: Autoclave Testing Methods & Results Australian Firm 4 Compartment Autoclave
Slide 32: Autoclave Testing Methods & Results
32 The Clarkdale Slag Project: Autoclave Testing Methods & Results • The last paragraph of the Australian Consulting Firm Executive Summary states: “The Run 2 gold recovery, determined on the basis of Arrakis method assay results, ranged from 7 - 21 g/t (calculated head basis) equivalent to 0.21 – 0
Slide 33: Autoclave Testing: 900L Titanium Autoclave
33 The Clarkdale Slag Project: Autoclave Testing Methods & Results • Due to the need to produce large quantities of PLS to determine optimum methods of extracting the gold from solution and not wishing to repeat the expense of pilot testing experienced in Australia, the decision was made to build or
Slide 34: 900 Liter Titanium Autoclave at Arrakis
34 The Clarkdale Slag Project: Autoclave Testing Methods & Results Autoclave support skid 900 L Titanium Autoclave 900 Liter Titanium Autoclave at Arrakis
Slide 35: Autoclave Testing: Iron Removal by Induction Melting
35 The Clarkdale Slag Project: Autoclave Testing Methods & Results • Pilot autoclave tests initially confirmed results on other POX and POL bench scale tests, but gold recovery from solution was still somewhat low (+ or – 50%). • The technical team at Arrakis decided to remove the iron from the slag
Slide 36: Autoclave Testing: PAC Run Results
36 The Clarkdale Slag Project: Autoclave Testing Methods & Results • Two PAC runs consisting of the above described method recovered 0.399 opt Au by fire assay beads and the remainder of products were fire assayed showing a back calculated head value of 0.5045 opt Au for a net recovery of 79%. The f
Slide 37: Testing Methods & Results: Ambient Leach of Glass
37 The Clarkdale Slag Project: Testing Methods & Results • Subsequent POL pilot autoclave runs have shown similar results and recovery of the gold from the glass PLS can be achieved by direct precipitation, resin, or carbon. • In our continuing search for the most cost effective method of recovery o
Slide 38: Autoclave Testing: Bench Scale POX of Ground Glass
38 The Clarkdale Slag Project: Autoclave Testing Methods & Results • Most recently we have begun to run bench scale POX autoclave tests using .5kg samples of the finely ground glass and then leaching the residue in cyanide or thiosulfate. • While we have just started this testing regimen and more re
Slide 39: Autoclave Testing Observations
39 The Clarkdale Slag Project: Autoclave Testing Observations • We have now demonstrated that the gold contained in the Clarkdale smelter slag can be recovered (with varying percent recoveries) by: • POX on raw slag (with appropriate crushing and fine grinding) • POL on raw slag (with appropriate cr
Slide 40: Business Considerations
40 The Clarkdale Slag Project: Business Considerations • We have demonstrated that the gold contained in the smelter slag can be recovered by a variety of methods which would fit existing commercial processes being used in various locations around the world. • The project site has rail access allowi
Slide 41: Business Considerations
41 The Clarkdale Slag Project: Business Considerations • Operation of a demonstration plant will not only provide operating conditions and data for design of a full scale commercial plant, but should make financing of a commercial plant much easier by demonstrating the recovery of iron, zinc, and go
Slide 42: Searchlight Minerals: Unearthing Opportunities
—=H SEARCHLIGHT MINERALS Unearthing Opportunities
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