ASTM E2294-03

Standard Practice for Proof Silver Corrections in Metal Bearing Ores, Concentrates and Related Materials by Fire Assay Gravimetry

SIGNIFICANCE AND USE
This practice is primarily intended to be used for the correction of silver loss in the fire assay process. Silver assays are determined by fire assay for the purpose of metallurgical exchange between seller and buyer.
It is assumed that all who use this practice will be trained analysts capable of performing skillfully and safely. It is expected that work will be performed in a properly equipped laboratory under appropriate quality control practices such as those described in Guide E 882.
SCOPE
1.1 This standard practice covers the determination of fire assay correction for silver, utilizing proof silver, for ores, concentrates and related metallurgical materials.
1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (See Method E 1335, Practices E 50, Guide E 882, and ISO Guide 35).

General Information

• Status: Historical
• Publication Date: 09-Jun-2003
• ICS: 73.060.01 - Metalliferous minerals in general
• Technical Committee: E01 - Analytical Chemistry for Metals, Ores, and Related Materials
• Drafting Committee: E01.02 - Ores, Concentrates, and Related Metallurgical Materials

Relations

• Replaced By: ASTM E2294-03(2008)e1 - Standard Practice for Proof Silver Corrections in Metal Bearing Ores, Concentrates and Related Materials by Fire Assay Gravimetry
• Effective Date: 01-Nov-2008

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:E2294–03
Standard Practice for
Proof Silver Corrections in Metal Bearing Ores,
Concentrates and Related Materials by Fire Assay
Gravimetry
This standard is issued under the fixed designation E 2294; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope Smith, E.A.,The Sampling andAssay of Precious Metals
1.1 This standard practice covers the determination of fire
3. Terminology
assay correction for silver, utilizing proof silver, for ores,
3.1 Definitions—For definitions of terms used in this Prac-
concentrates and related metallurgical materials.
tice, refer to Terminology E 135.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Summary of Practice
responsibility of the user of this standard to establish appro-
4.1 In the process of fire assay, silver losses occur. Proof
priate safety and health practices and determine the applica-
silver is carried through the assay fusion and cupellation
bility of regulatory limitations prior to use. (See Method
procedures to determine losses that can provide the fire assay
E 1335, Practices E 50, Guide E 882, and ISO Guide 35).
silver correction values, (see Method E 1335, Method ISO
10378, Bugbee, , Smith).
2. Referenced Documents
2.1 ASTM Standards:
5. Significance and Use
E 29 Practice for Using Significant Digits in Test Data to
2 5.1 This practice is primarily intended to be used for the
Determine Conformance With Specifications
correction of silver loss in the fire assay process. Silver assays
E 50 Standard Practices for Apparatus, Reagents, and
3 are determined by fire assay for the purpose of metallurgical
Safety Precautions for Chemical Analysis of Metals
exchange between seller and buyer.
E 135 Standard Terminology relating to Analytical Chem-
2 5.2 It is assumed that all who use this practice will be
istry for Metals, Ores, and Related Materials
trained analysts capable of performing skillfully and safely. It
E 882 Guide for Accountability and Quality Control in the
2 is expected that work will be performed in a properly equipped
Chemical Analysis of Metals
laboratory under appropriate quality control practices such as
E 1335 Test Methods for Determination of Gold in Bullion
2 those described in Guide E 882.
by Cupellation
2.2 Other Documents
6. Apparatus
ISO Guide 35: 1989, Certification of Reference Materials-
6.1 Analytical balance—Capable of weighing to 0.001 mg
General and Statistical Principles
6.2 Assay furnace—Capable of temperatures up to 1100 °C,
ISO 10378:1994, Copper Sulfide Concentrates- Determina-
accurate to 65°C
tion of Gold and Silver Contents- Fire Assay Gravimetric
6.3 Hammer—Blacksmith type
and Atomic Absorption Spectrometric Method
4 6.4 Hammering block—Flat Steel plate
Bugbee, Edward, Textbook of Fire Assaying
7. Reagents and Materials
7.1 Purity of Reagents—Reagent grade chemicals shall be
This practice is under the jurisdiction of ASTM Committee E01 on Analytical
used in all tests. Unless otherwise indicated, it is intended that
Chemistry for Metals, Ores and Related Materials and is the direct responsibility of
Subcommittee E01.02 on Ores, Concentrates, and Related Metallurgical Materials . all reagents conform to the specifications of the Committee on
Current edition approved June 10, 2003. Published July 2003.
Analytical Reagents of the American Chemical Society where
Annual Book of ASTM Standards, Vol 14.02.
Annual Book of ASTM Standards, Vol 03.05.
4 5
Bugbee, E. E., A Textbook of Fire Assaying, John Wiley and Sons, Inc., Third Smith, E. A., The Sampling and Assay of the Precious Metals, Charles Griffin
Ed., 1946. and Co., Ltd., Second Ed., 1947.
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