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Ref. No.: iSO/ R 309 - 1963 (E)
IS0
I N T ERN AT1 O N A L ORGAN I ZATl O N FOR STAN D AR D IZATl O N
IS0 RECOMMENDATION
R 309
METHODS OF SAMPLING MANGANESE ORES
PART I -ORE LOADED IN FREIGHT WAGONS
1st EDITION
July 1963
COPYRIGHT RESERVED
The copyright of IS0 Recommendations and IS0 Standards
belongs to IS0 Member Bodies. Reproduction of these
documents, in any country, may be authorized therefore only
by the national standards organization of that country, being
a member of ISO.
For each individual country the only valid standard is the national standard of that country.
Printed in Switzerland
Also issued in French and Russian. Copies to be obtained through the national standards organizations.
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BRIEF HISTORY
The IS0 Recommendation R 309, Methods of Sampling Manganese Ores-Part I-
Ore Loaded in Freight Wagons, was drawn up by Technical Committee ISO/TC 65, Manga-
nese Ores, the Secretariat of which is held by the Komitet Standartov, Mer i Izmeritel’nyh
Priborov pri Sovete Ministrov SSSR.
Work on this question by the Technical Committee began in 1954 and led, in 1957,
to the adoption of a Draft IS0 Recommendation.
In October 1958, this Draft IS0 Recommendation (No. 257) was circulated to all
the IS0 Member Bodies for enquiry. It was approved by the following Member Bodies:
Austria Germany Poland
Bulgaria Hungary Portugal
Romania
Burma India
Spain
Chile Ireland
Czechoslovakia Italy United Kingdom
Netherlands U.S.S.R.
France
One Member Body opposed the approval of the Draft: Japan.
The Draft IS0 Recommendation was then submitted by correspondence to the IS0
Council, which decided, in July 1963, to accept it as an IS0 RECOMMENDATION.
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lSO/ R 309 - 1963 (E)
IS0 Recommendation R 309 July 1963
METHODS OF SAMPLING MANGANESE ORES
PART I - ORE LOADED IN FREIGHT WAGONS
1. SCOPE
The method described in this IS0 Recommendation is intended for the sampling of ore loaded
in freight wagons, and should be used at the place of shipment and at the place of acceptance.
The method is applicable to the sampling of all manganese ores.
2. GENERAL CONDITIONS
2.1 The varied nature of the types of ore and of the conditions governing their sampling makes
it impossible to lay down strict rules for sampling. In order to make the samples repre-
sentative, it is necessary to be guided by the principles given below. It is important that
sampling should be done by qualified samplers.
2.2 This IS0 Recommendation covers methods of selection and preparation of samples of
(a) ore containing lumps of sizes not exceeding 50 mm;
(b) ore containing a proportion of lumps larger than 50 mm.
Ore loaded in freight wagons may be arranged in
flat layers,
conical mounds, or
combinations of flat layers and conical mounds.
2.3 Certificated samples should consist of increments which have been uniformly taken, by agree-
ment between the parties concerned, from each freight wagon or group of freight wagons
loaded with ore.
2.4 Each certificated sample should consist of the necessary number of increments, each increment
being taken from one point.
2.5 The recommended number of increments constituting the certificated sample of manganese ore,
depending on the mass of the ore being sampled and its uniformity (determined mainly
by ore size and manganese content), is calculated from the following formula:
N=CVQ
where
N = number of increments;
C = coefficient depending on the uniformity of ore and equal to
(a) 1.5 for uniform ore;
(b) 2.5 for ore of average uniformity;
(c) 3.0 for ore which is not uniform;
Q = total mass of the ore being sampled, in tonnes.
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lSO/ R 309 - 1963 (E)
The number of increments constituting a certificated sample as calculated from the above
formula is shown in Table 1 below.
TABLE 1
Number of increments for ores of different uniformity
I
Mass of ore being sampled
Uniform Average uniformity Not uniform-
size < 50 mm
size < 50 rnm containing lumps> 50 rn
manganese content manganese content irrespective of
> 43 per cent < 43 per cent manganese content
tonnes (t)
up to 100
15 25 30
100 to 200 20 35 40
200 to 300 25 40 50
300 to 400 30 50 60
400 to 500
35 60 70
500 to 600 40 65 75
600 to 700 40 65 80
700 to 800 40 70 85
800 to 900
45 75 90
900 to 1000
50 85 1 O0
1000 to 1250 50 90 105
1250to 1500 60 1 O0 120
1500 to 1750 60 105 125
1750 to 2000
70 110 135
2000 to 3000 80 140 165
3000 to 4000 90 190
160
4000 to 5000 105 175 210
5000 to 8000
135 225 270
8000 to 10000 150 300
250
NOTES
1. Subject to agreement between the parties concerned, the number of increments may be
increased, but may not be decreased.
2. Each increment should have approximately a volume of 1 litre, or a mass of 2 kg.
2.6 The minimum number of increments necessary may be calculated from the following
formula:
V2
N=K-
P2
where
N = minimum number of increments necessary;
K = coefficient guaranteeing the accuracy of the test being equal to not less than 1
(for K =I
guaranteed accuracy = 68.3 per cent);
V = coefficient of variation in the constituent of ore being sampled (e.g. degree of
variation in the manganese content) ;
P = limits of tolerance on sampling equal to the limits of tolerance for the adopted
method of determination of the constituent of ore to be controlled, expressed
as a percentage.
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I
iÇO/ R 309 - 1963 (E)
2.7 Points selected for taking increments should be located chequer-wise, whether for one freight
wagon or for a given number of freight wagons.
2.8 For ore lying in flat layers, Figures 1, 2 and 3 illustrate examples of the Iocation of points
for taking the increments from one freight wagon and from a given number of freight wagons.
F,==== = I
-02 == T
---A
t ----- 4
-----
etc., up to 25 freight wagons inclusive
NOTE. If the group consists of freight wagons of different load capacities, the number of sam-
pling points is determined according to the capacity of the wagons.
2.9 For ore lying in conical mounds, the location of points for taking the increments is given in
Figure 4.
The sampling points are located:
at 'Is of the mound height,
at z/3 of the mound height,
at the mound base.
FIGURE 4.-Location of points for taking increments
(ore lying in conical mounds)
2.10 For ore lying in combinations of flat layers and conical mounds, the increments are taken
at uniformly distributed points :
(a) for ore lying in flat layers, along the lines shown in Figures 1 to 3.
(b) for ores lying in conical mounds, at the points shown in Figure 4.
2.11 Sampling is carried out immediately after the freight wagons together with the ore have been
weighed.
2.12 Samples are taken by samplers appointed by the supplier and the user. Samplers must keep
the selected samples under constant observation.
2.13 The chemical analyses of the ore at shipment and acceptance should be carried out according
to the particular standard laid down for the supplier and the user. The number of con-
stituents to be determined in the chemical analysis of manganese ores should be in accord-
ance with the contract concerning the delivery of ore.
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KO/ R 309 - 1963 (E)
2.1
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