CA2703276A1 - Method for improving ore extraction - Google Patents
Method for improving ore extraction Download PDFInfo
- Publication number
- CA2703276A1 CA2703276A1 CA 2703276 CA2703276A CA2703276A1 CA 2703276 A1 CA2703276 A1 CA 2703276A1 CA 2703276 CA2703276 CA 2703276 CA 2703276 A CA2703276 A CA 2703276A CA 2703276 A1 CA2703276 A1 CA 2703276A1
- Authority
- CA
- Canada
- Prior art keywords
- ore
- caverns
- cavern
- set forth
- extraction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000000605 extraction Methods 0.000 title claims abstract description 17
- 230000003190 augmentative effect Effects 0.000 claims abstract description 7
- 238000000151 deposition Methods 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 21
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 2
- 238000005065 mining Methods 0.000 description 12
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 239000002904 solvent Substances 0.000 description 4
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 3
- 239000012267 brine Substances 0.000 description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 235000010755 mineral Nutrition 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 2
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- PALNZFJYSCMLBK-UHFFFAOYSA-K magnesium;potassium;trichloride;hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-].[Cl-].[K+] PALNZFJYSCMLBK-UHFFFAOYSA-K 0.000 description 2
- 229940072033 potash Drugs 0.000 description 2
- BWHMMNNQKKPAPP-UHFFFAOYSA-L potassium carbonate Substances [K+].[K+].[O-]C([O-])=O BWHMMNNQKKPAPP-UHFFFAOYSA-L 0.000 description 2
- 235000015320 potassium carbonate Nutrition 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 239000000039 congener Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012452 mother liquor Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000010587 phase diagram Methods 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000012265 solid product Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/28—Dissolving minerals other than hydrocarbons, e.g. by an alkaline or acid leaching agent
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C45/00—Methods of hydraulic mining; Hydraulic monitors
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
There is disclosed a method of augmenting ore extraction from a solution mine having caverns comprising: providing at least a pair of opposed caverns containing ore to be extracted; extracting ore from one cavern of the caverns; recovering ore to exhaust the one cavern; depositing tailings from an ore exhausted cavern into the ore exhausted cavern and extracting ore from other said cavern of said caverns.
Description
METHOD FOR IMPROVING ORE EXTRACTION
TECHNICAL FIELD
The present invention is directed to a method for enhancing ore extraction and more particularly, the present invention is directed to a method and a system for augmenting or extraction in a solution mine environment.
BACKGROUND OF THE INVENTION
As is well documented, solution mining has been known for many years. One of the early examples of this technology is found in United States Patent No.
4,753,485, issued to Goodheart, issued June 28, 1988. The patent disclosed a method for improving the recovery of minerals from a subsurface formation. The patent teaches the use of an outer loop borehole formed from a vertical shaft with the provision of a leaching fluid which is injected into the outer loop to leach away minerals that are approximate the loop.
Further, in United States Patent No. 3,366,419, issued January 30, 1968 to Pasternak et al teaches solution mining method making use of a suitable solvent and particular method of well formation and further by alternating cycles of selective and non-selective disillusion of the solvent.
Day, in United States Patent No. 3,355,212, issued November 28, 1967, teaches a method for solution mining of carnallite. In the methodology, it is indicated that the solution mining is achieved by making use of an aqueous solution of magnesium chloride and potassium chloride in the concentrations corresponding to particular phase diagram relationships where the carnallite is dissolved without decomposition of the ore.
Higgins, in United States Patent No. 4,418,960, issued December 6, 1983, teaches methodology for multiple bed solution mining of an inclined structure. In the method the patentee teaches the covering of pot ash and congeners minerals from multiple beds of relatively thin inclined strata at substantial depth. A single bore hold is provided for dissolution of each ore strata overlain by an insoluble and an impermeable strata with the order beginning from the deepest ore strata. Water is employed as an injectant down the bore hole at a predetermined rate and flows from the drill hole. Once charged, the heavy brine then flows down the bottom of the cavity to an outflow pipe communicating with the cavity.
In United States Patent No. 6,022,080, issued February 8, 2000, to Gruschow et al, there is disclosed a process and system for the solution mining of the evapourites and preparation of saline solutions. In the process and system the disclosure solvent is heated by a solar pond. The heated solvent is then introduced into a cavern to be solution mined to produce a production brine which is then heated. The brine is then removed from the cavern and cooled along with water evaporation. The result is solid crystallization and separation producing a solid product and a cold mother liquor.
Pickren, in United States Patent No. 6,582,025, issued June 24, 2003 teaches a sulphur storage method. The reference teaches that solution mined salt enclosed cavities are solution mined and the stored sulphur is withdrawn using pressurized hot water through first space created within the bore hole and pressurized air through a second space. This causes the sulphur within the cavity to melt and to rise to the surface of the earth through a centric space within the bore hole.
Given the activity in the solution mining field at various developments that were patented, none of the techniques facilitated maximum recovery of the ore from within a cavern. This has been primarily due to the face that the stability of the cavern had to be maintained with a pillar etc. in order to prevent subsidence. The result of this is that much of the extractable ore must be left within the formation in order to comply with various regulations and avoid subsidence.
The present invention has resulted in methodology and a system where ore extraction can be augmented and maximized without running a foul of subsidence concerns and also any environmental concerns.
SUMMARY OF THE INVENTION
One object of one embodiment of the present invention is to provide a method of improved ore extraction from an ore body.
TECHNICAL FIELD
The present invention is directed to a method for enhancing ore extraction and more particularly, the present invention is directed to a method and a system for augmenting or extraction in a solution mine environment.
BACKGROUND OF THE INVENTION
As is well documented, solution mining has been known for many years. One of the early examples of this technology is found in United States Patent No.
4,753,485, issued to Goodheart, issued June 28, 1988. The patent disclosed a method for improving the recovery of minerals from a subsurface formation. The patent teaches the use of an outer loop borehole formed from a vertical shaft with the provision of a leaching fluid which is injected into the outer loop to leach away minerals that are approximate the loop.
Further, in United States Patent No. 3,366,419, issued January 30, 1968 to Pasternak et al teaches solution mining method making use of a suitable solvent and particular method of well formation and further by alternating cycles of selective and non-selective disillusion of the solvent.
Day, in United States Patent No. 3,355,212, issued November 28, 1967, teaches a method for solution mining of carnallite. In the methodology, it is indicated that the solution mining is achieved by making use of an aqueous solution of magnesium chloride and potassium chloride in the concentrations corresponding to particular phase diagram relationships where the carnallite is dissolved without decomposition of the ore.
Higgins, in United States Patent No. 4,418,960, issued December 6, 1983, teaches methodology for multiple bed solution mining of an inclined structure. In the method the patentee teaches the covering of pot ash and congeners minerals from multiple beds of relatively thin inclined strata at substantial depth. A single bore hold is provided for dissolution of each ore strata overlain by an insoluble and an impermeable strata with the order beginning from the deepest ore strata. Water is employed as an injectant down the bore hole at a predetermined rate and flows from the drill hole. Once charged, the heavy brine then flows down the bottom of the cavity to an outflow pipe communicating with the cavity.
In United States Patent No. 6,022,080, issued February 8, 2000, to Gruschow et al, there is disclosed a process and system for the solution mining of the evapourites and preparation of saline solutions. In the process and system the disclosure solvent is heated by a solar pond. The heated solvent is then introduced into a cavern to be solution mined to produce a production brine which is then heated. The brine is then removed from the cavern and cooled along with water evaporation. The result is solid crystallization and separation producing a solid product and a cold mother liquor.
Pickren, in United States Patent No. 6,582,025, issued June 24, 2003 teaches a sulphur storage method. The reference teaches that solution mined salt enclosed cavities are solution mined and the stored sulphur is withdrawn using pressurized hot water through first space created within the bore hole and pressurized air through a second space. This causes the sulphur within the cavity to melt and to rise to the surface of the earth through a centric space within the bore hole.
Given the activity in the solution mining field at various developments that were patented, none of the techniques facilitated maximum recovery of the ore from within a cavern. This has been primarily due to the face that the stability of the cavern had to be maintained with a pillar etc. in order to prevent subsidence. The result of this is that much of the extractable ore must be left within the formation in order to comply with various regulations and avoid subsidence.
The present invention has resulted in methodology and a system where ore extraction can be augmented and maximized without running a foul of subsidence concerns and also any environmental concerns.
SUMMARY OF THE INVENTION
One object of one embodiment of the present invention is to provide a method of improved ore extraction from an ore body.
A further object of one embodiment of the present invention is to provide a method of augmenting ore extraction from a solution mined having caverns, comprising:
providing at least a pair of opposed caverns containing ore to be extracted;
extracting ore from one cavern of said caverns;
recovering ore to exhaust the one cavern;
depositing tailings from an ore exhausted cavern into the ore exhausted cavern;
and extracting ore from the other cavern.
Advantageously, by establishing a paired cavern system, the depleted or exhausted cavern can then function to restore the tailings which, in the case of the pot ash solution mining example would be sodium chloride tailings.
A further object of one embodiment of the present invention is to provide a solution mine system for augmenting ore recovery from an ore body, comprising:
a plurality of caverns radially arranged;
a central vertical well for collection of solved ore from the caverns; and an injection well in fluid communication with each said cavern and the central vertical well, the caverns being extractable in opposed pairs, whereby an extracted cavern of a pair stores tailings produced from extraction of an ore therefrom.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the invention, reference can now be made to the accompanying drawings illustrating preferred embodiments:
In Figure 1, shown is a conventional cavern and solution mining arrangement with one cavern shown;
Figure 2 is a top plan view of a preferred embodiment of the present invention;
and Figure 3 is a top plan view of an alternate embodiment of the present invention.
Similar numerals used in the drawings denote similar elements.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
I refer now to Figure 1, numeral 10 globally denotes the overall general configuration of a solution mining employing caverns. In the Figure, the cavern 12 is obviously disposed within the seam 14 of ore. The cavern 12 communicates with a vertical well 16 which extends from cavern 12 to the surface 18. It is obvious that other processing equipment will be connected to the top of the vertical well 16 and thus would be positioned at the top of the surface 18. None of this is shown in the drawing as it is well understood by those skilled.
Cavern 12 also communicates with the horizontal injection well, globally denoted by number 20. The well obviously extends from the surface 18 at 22 through to the cavern 12 as illustrated. As is generally known the injection well 20 is drilled substantially along the seam 14. The length is primarily dictated by the homogeneity of the seam.
Referring now to Figure 2, shown is a plan view of one embodiment of the patterned solution of mining layout. As is indicated in Figure 2, opposed cavern pairs, for example pair AB and pair CD etc., are in opposition to one another and opposed to the central well 16. The distance from the central well 16 to a respective cavern is approximately 3 km. This "pin wheel" design allows for approximately 70% of the deposit for extraction which is twice as effective as the state of the art technology today which vividly has an extraction efficiency of about 35%. This is primarily due to the need to leave a pillar(s) (not shown) which have to be left in the ground upon extraction of the ore to prevent subsidence. With the pinwheel design as shown in Figure 2, the extraction efficiency can be increased since the pillar can be removed. By incorporating the pinwheel design, as shown in Figure 2, once the cavern A is completely depleted of ore, then the tailings from the extraction of ore can be reinserted into the cavern A. This prevents the need for leaving pillars or other structural members for preventing subsidence and, at the same time, efficiently handle storage of the non-toxic tailings.
providing at least a pair of opposed caverns containing ore to be extracted;
extracting ore from one cavern of said caverns;
recovering ore to exhaust the one cavern;
depositing tailings from an ore exhausted cavern into the ore exhausted cavern;
and extracting ore from the other cavern.
Advantageously, by establishing a paired cavern system, the depleted or exhausted cavern can then function to restore the tailings which, in the case of the pot ash solution mining example would be sodium chloride tailings.
A further object of one embodiment of the present invention is to provide a solution mine system for augmenting ore recovery from an ore body, comprising:
a plurality of caverns radially arranged;
a central vertical well for collection of solved ore from the caverns; and an injection well in fluid communication with each said cavern and the central vertical well, the caverns being extractable in opposed pairs, whereby an extracted cavern of a pair stores tailings produced from extraction of an ore therefrom.
BRIEF DESCRIPTION OF THE DRAWINGS
Having thus generally described the invention, reference can now be made to the accompanying drawings illustrating preferred embodiments:
In Figure 1, shown is a conventional cavern and solution mining arrangement with one cavern shown;
Figure 2 is a top plan view of a preferred embodiment of the present invention;
and Figure 3 is a top plan view of an alternate embodiment of the present invention.
Similar numerals used in the drawings denote similar elements.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
I refer now to Figure 1, numeral 10 globally denotes the overall general configuration of a solution mining employing caverns. In the Figure, the cavern 12 is obviously disposed within the seam 14 of ore. The cavern 12 communicates with a vertical well 16 which extends from cavern 12 to the surface 18. It is obvious that other processing equipment will be connected to the top of the vertical well 16 and thus would be positioned at the top of the surface 18. None of this is shown in the drawing as it is well understood by those skilled.
Cavern 12 also communicates with the horizontal injection well, globally denoted by number 20. The well obviously extends from the surface 18 at 22 through to the cavern 12 as illustrated. As is generally known the injection well 20 is drilled substantially along the seam 14. The length is primarily dictated by the homogeneity of the seam.
Referring now to Figure 2, shown is a plan view of one embodiment of the patterned solution of mining layout. As is indicated in Figure 2, opposed cavern pairs, for example pair AB and pair CD etc., are in opposition to one another and opposed to the central well 16. The distance from the central well 16 to a respective cavern is approximately 3 km. This "pin wheel" design allows for approximately 70% of the deposit for extraction which is twice as effective as the state of the art technology today which vividly has an extraction efficiency of about 35%. This is primarily due to the need to leave a pillar(s) (not shown) which have to be left in the ground upon extraction of the ore to prevent subsidence. With the pinwheel design as shown in Figure 2, the extraction efficiency can be increased since the pillar can be removed. By incorporating the pinwheel design, as shown in Figure 2, once the cavern A is completely depleted of ore, then the tailings from the extraction of ore can be reinserted into the cavern A. This prevents the need for leaving pillars or other structural members for preventing subsidence and, at the same time, efficiently handle storage of the non-toxic tailings.
Turning to Figure 3, shown is an alternate embodiment of the pinwheel design where the arrangement is substantially polygonal. In this embodiment the satellite caverns 12 are positions in substantially a square formation with the vertical well exposed approximately centrally of the satellite caverns 12. By incorporating the methodology herein, the extraction of ore from a body in solution mining can be significantly enhanced owing to the fact that the subsidence problem is elevated by making use of the tailings which would otherwise be disposed of.
Although embodiments of the invention have been described above, it is not limited thereto and it will be apparent to those skilled in the art that numerous modifications form part of the present invention insofar as they do not depart from the spirit, nature and scope of the claimed and described invention.
Although embodiments of the invention have been described above, it is not limited thereto and it will be apparent to those skilled in the art that numerous modifications form part of the present invention insofar as they do not depart from the spirit, nature and scope of the claimed and described invention.
Claims (8)
1. A method of augmenting ore extraction from a solution mine having caverns, comprising:
providing at least a pair of opposed caverns containing ore to be extracted;
extracting ore from one cavern of said caverns;
recovering ore to exhaust said one cavern;
depositing tailings from an ore exhausted cavern into said ore exhausted cavern; and extracting ore from other said cavern of said caverns.
providing at least a pair of opposed caverns containing ore to be extracted;
extracting ore from one cavern of said caverns;
recovering ore to exhaust said one cavern;
depositing tailings from an ore exhausted cavern into said ore exhausted cavern; and extracting ore from other said cavern of said caverns.
2. The method as set forth in claim 1, wherein said caverns are arranged in a radially spaced apart pattern.
3. The method as set forth in claim 1, wherein said caverns are commonly connected to a vertically oriented well.
4. The method as set forth in claim 3, wherein each said cavern is connected by an injection well to said vertical well.
5. The method as set forth in claim 1, including a plurality of pairs of caverns.
6. The method as set forth in claim 1, wherein said caverns are arranged in a circular pattern.
7. The method as set forth in claim 1, wherein said caverns are arranged in a polygonal pattern.
8. A solution mine system for augmenting ore recovery from an ore body, comprising:
a plurality of caverns radially arranged;
a central vertical well for collection of solved ore from said caverns; and an injection well in fluid communication with each said cavern and said central vertical well , said caverns being extractable in opposed pairs, whereby an extracted cavern of a pair stores tailings produced from extraction of said ore.
a plurality of caverns radially arranged;
a central vertical well for collection of solved ore from said caverns; and an injection well in fluid communication with each said cavern and said central vertical well , said caverns being extractable in opposed pairs, whereby an extracted cavern of a pair stores tailings produced from extraction of said ore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2703276A CA2703276C (en) | 2010-05-05 | 2010-05-05 | Method for improving ore extraction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA2703276A CA2703276C (en) | 2010-05-05 | 2010-05-05 | Method for improving ore extraction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2703276A1 true CA2703276A1 (en) | 2011-11-05 |
| CA2703276C CA2703276C (en) | 2015-11-17 |
Family
ID=44900836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2703276A Active CA2703276C (en) | 2010-05-05 | 2010-05-05 | Method for improving ore extraction |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2703276C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392129A (en) * | 2011-11-17 | 2012-03-28 | 五矿（北京）稀土研究院有限公司 | Method and system of in-situ ore leaching and leachate discharge of ion adsorption type ore |
-
2010
- 2010-05-05 CA CA2703276A patent/CA2703276C/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102392129A (en) * | 2011-11-17 | 2012-03-28 | 五矿（北京）稀土研究院有限公司 | Method and system of in-situ ore leaching and leachate discharge of ion adsorption type ore |
| CN102392129B (en) * | 2011-11-17 | 2014-01-08 | 五矿（北京）稀土研究院有限公司 | Method and system of in-situ ore leaching and leachate discharge of ion adsorption type ore |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2703276C (en) | 2015-11-17 |
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| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request |
Effective date: 20140626 |