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1. INDIAN SYSTEM: Prior to 1981, there was no
nationally accepted system in India. Different agencies followed different
system like USGS, Russian etc. In 1981,
a system was standardized which underwent minor modifications later on to fit
in with the practical data collected for the National Mineral Development
database of IBM. This system is schematically shown as follows:
Figure 1:
Earlier Classification (as shown in KK Chatterjee document)
As can be seen, the system is
2-dimensional, with no distinction between technical and economic, and with
an emphasis on geological axis. The parameters are also very few and, to a
great extent, subjective. For geological axis the parameters are primarily
spacing of the observation points (e.g. boreholes, pits, and trenches), scale
of geological maps, and inferences drawn therefrom. The techno-economic
parameters are grade, amenability to beneficiation, thickness and depth (more
particularly in case of coal) and some general conditions of constraints of
environment, forest, market etc. After a laborious and prolonged effort
comprising training, conferences and interactions through the instrument of
national mineral inventory, this classification system percolated down to the
level of individuals and organizations concerned with exploration, mining,
planning and administration in the mineral sector of India, and now, since
1981, are firmly entrenched in the Indian mindset.
2. UNFC
System: UNFC is a 3D (3 dimensional) system, the 3 axes being Economic, Feasibility and Geological.
The categories of resource estimation are denoted by EFG digital codes as
follows.
Axis
|
Economic Axis (E)
|
Category
|
Economic
|
Potentially
Economic
|
Intrinsically
Economic
|
Code
|
1
|
2
|
3
|
Axis
|
Feasibility Axis (F)
|
Category
|
Feasibility Study
& Mining Report
|
Pre-Feasibility
Study
|
Geological
Study
|
Code
|
1
|
2
|
3
|
Axis
|
Geological Axis (G)
|
Category
|
Detailed Exploration
|
General Exploration
|
Prospecting
|
Reconnaissance
|
Code
|
1
|
2
|
3
|
4
|
Thus, the codes of categories can
vary from the highest (111) to the
lowest (334). The standard terms along with their codes are as follows.
Terms and Codes in UNFC
|
S. No.
|
Category description
|
Reserve/Resource
|
EFG Code
|
1
|
Mineral Reserve
(economically mineable part of measured/indicated mineral resource
|
Proved
|
(111)
|
Probable
|
(121) & (122)
|
2
|
Total Mineral Resource(Intrinsic
economic interest, reasonable prospect for eventual economic extraction)
|
Measured
|
(331)
|
Indicated
|
(332)
|
Inferred
|
(333)
|
3
|
Feasibility mineral Resource
|
|
(211)
|
4
|
Pre-feasibility mineral Resources
|
|
(221, 222)
|
5
|
Reconnaissance Resource
|
|
(334)
|
The UNFC system is relatively
more objective, and because of the use of numerical codes, it is independent of
language or country barriers, and hence, globally understandable.
3. Relationship
between Indian and UNFC systems: In both
systems, there are 8 standard terms used as follows.
Terms used
|
Indian System
|
UNFC System
|
Proved In-situ reserve
|
Proved reserve
|
Proved recoverable reserve
|
Probable reserve
|
Probable in-situ reserve
|
Measured resource
|
Probable recoverable reserve
|
Indicated resource
|
Possible in-situ reserve
|
Inferred resource
|
Possible recoverable reserve
|
Feasibility resource
|
Prospective resource
|
Prefeasibility resource
|
Conditional resource
|
Reconnaissance resource
|
(Note: no one to one correlation
between both systems)
|
But since the practical
parameters are different, there is no simple one-to-one correspondence between
the terms of the two systems.
4. Implementation
of UNFC System in India
4.1. Decision
making process: Both the Government and the mineral industry of India were
represented in the Geneva Conference of the United Nations Economic Commission
for Europe (UNECE) in November, 1999 where the decision for adoption and
implementation of UNFC was finally taken after completion of a trial period.
After that, the Government took a decision in principle to implement UNFC in
India in view of the already started process of liberalizing the Indian mining
industry and opening it up to multinational investors for exploration and
mining, for which India needed capital and technology. At the same time, it was
considered necessary to project a relatively more realistic and objective
picture of India’s known mineral resource inventory. Further, in view of the
prevailing system of a large number of geologists and mining engineers
belonging to thousands of agencies independently engaged in resource estimation
in India, it was thought that the broad exploration guidelines of UNFC may
leave a wide scope of varying interpretation and that a set of practical field
guidelines in quantitative terms needed to be standardized. So, in May, 2000
the Ministry of Mines (MOM), Government of India constituted a Task Force to
formulate field guidelines for exploration as per UNFC, the report of which was
submitted in August, 2000.
For the purpose of these
guidelines, mineral deposits were grouped into 7 types as follows.
1.
Stratiform,
stratabound and tabular deposits of regular habit
2.
Stratiform,
stratabound and tabular deposits of irregular habit
3.
Lenticular
bodies of all dimensions including bodies occurring en-echelon, silicified
linear zones of composite veins
4.
Lenses,
veins and pockets; stock-works, irregular shaped, modest to small size bodies
5.
Gem
stones and rare metal pegmatites, reefs and veins
6.
Placer
and residual mineral deposits of hill and valley wash
7.
Dimension
stones
Further, within the broad
guidelines of UNFC, micro-level parameters were also identified for application
in India. These parameters are:
a) Economic viability: Detailed
geological knowledge, mining report/plan, specific end use grade reserves,
forest/non-forest and other land-use data.
b) Feasibility
study: Geological
study including infrastructure, meteorology and ecology aspects; mining plans
including issues pertaining to methods, recovery, manpower; environmental study
including baseline data generation and impact analysis; beneficiation studies
at laboratory, pilot plant and industrial scales; analysis of both capital and
operational costs; analysis of needs of infrastructure, construction and
services; marketing analysis covering demand-supply and industry structure; cash
flow forecasts; issues related to labor, land, mining and taxation.
c) Geological
exploration: Aerial reconnaissance by remote sensing and airborne geophysical
survey; geological mapping; geochemical survey covering analysis of samples,
geomorphology, drainage and vegetation; ground geophysical survey; pitting,
trenching, drilling and sampling; petrographic and minerographic studies; rock
mechanics studies (for dimension/building stones).
Depending on the type of mineral
deposit, the quantum/level of work/analysis/study under these parameters the
category of resource estimate may vary.
These Guidelines were thoroughly
discussed during and after a seminar organized in Agra, India, under the aegis
of UNECE, MOM and the Federation of Indian Mineral Industries (FIMI), and
thereafter these were widely circulated to all the agencies concerned with resource
estimation/evaluation: both in the Government and in the private sector. The
final version of the Guidelines was submitted to the Government in February,
2001.
In May, 2001, the Government of
India took the decision in favor of doing away with the Indian system of
resource classification system and implementation of UNFC in India. After a
prolonged consultation at different levels on the modalities of implementation,
the decision was taken to the political level conference of the Central
Government and all the State Government ministers of mines in January, 2003,
wherein the final stamp of approval has been given. Thus the decision making
process at all the 3 levels: technical, administrative and political has been
completed.
4.2. Strategy of implementation: The
strategy of implementation as finalized by the Government of India mainly
consisted in:
1.
Conversion of the National Mineral Inventory database of IBM covering
over 16000 deposits/leases/mines of 64 non-coal solid minerals, from Indian
system to UNFC system.
2.
Ensuring future resource estimation data generation as per UNFC through
a.
exploration according to the field guidelines as per UNFC, in both
freehold and leasehold; and
b.
Amendment of the Mineral Conservation & Development Rules
(MCDR) to make it statutorily obligatory for all non-coal major solid mineral
mines to report to IBM, resource data classified as per UNFC system.
The non-coal solid
mineral inventory database of IBM is presently available here is as on 1.4 2000 incorporating the knowledge of
all mineral deposits accrued till this point of time throughout the past, and
it will be updated regularly, and it was due for next (from current 1.4.2000
database)updation as on 1-4-2005(status
of this updation need citation). Digging out old exploration reports and re-evaluating those data
deposit by deposit or mine by mine would be an unpractical approach. So, a
practical approach has been adopted. To begin with, a simple conversion table
(Appendix-1) has been devised on the basis of experience of handling the data
and after analyzing their nature. The idea is that the present database should
get converted on one time basis albeit not with 100% accuracy, but with
successive updating’s based on progressive exploration in more and more of the
already identified and documented deposits/mines, the accuracy will keep
improving. It is expected that after a few updating’s, the accuracy will reach
near perfection. In India there are many traditional small mines (e.g. bentonite,
stones, clays etc.) where no geological exploration nor any feasibility nor
prefeasibility study has ever been carried out, yet their economic viability is
beyond doubt, since the mine owners are mining, selling and earning profit on
their products. In such case "extended
codes” of UNFC will apply (e.g. 133). The impact of the
conversion to UNFC on the inventory as on 1-4-2000
has been studied for 4 minerals namely copper, lead-zinc, chromite and rock
phosphate, which is shown in Appendix-2. It can be seen that large
parts of hitherto reported “reserve” as per Indian system are now relegated to
“resource” after implementation of UNFC system. So far as coal and lignite are concerned,
the GSI has taken initiative for implementing UNFC.
Secondly, for ensuring future
exploration as per UNFC guidelines in both freehold and leasehold areas, it has
been planned that IBM would organize extensive training programmes on field
guidelines at different centers across the country targeting geologists and mining
engineers of various Central and State Government organizations, and of the industries.
Subsequently, GSI and some other organizations would also conduct their
in-house training programmes in association with IBM.
Thirdly, for ensuring implementation
of UNFC in non-coal major mineral leasehold areas, it has been decided by the
Government to amend the Rules making it statutorily obligatory for all mine owners,
to comply. They are required to report to IBM every month as well as annually, the
information on the balance reserves available in their respective leases.
5. Conclusions
The whole process of decision
making on adoption and implementation of UNFC in India has been through the
period from November, 1999 to
January, 2003. Summing up, the following points stand out prominently
1. India is
a large, democratic and populous country with mineral resource data being
generated continually at thousands of centers.
2. In the
same deposit, more than one agency may explore at the same time or the same
agency may explore at different times, with a possibility that resources may be
estimated under different categories in different parts of the same deposit.
The process is dynamic.
3. Mineral
administration and legislative system in India is complex, with authorities
vested on a large number of Central and State Government ministries and
departments. There is also a multiplicity of laws for regulation of mining
related activities.
4. Strategies
for tackling past data contained in the national mineral inventory and for
future exploration in freehold and leasehold areas have been formulated.
5. With a
view to minimizing scope of variation in interpretation of the broad guidelines
of UNFC by thousands of geologists and mining engineers independently generating
resource estimation data, different sets of practical field guidelines in quantitative
terms have been standardized for different types of mineral deposits.
6. For
promoting practice of the new guidelines, a mixed approach consisting of
extensive training and amendment of law has been adopted.
7. The
entire process of implementation has been steadily and systematically institutionalized
at all 3 levels — technical, administrative and political.
As in April, 2003, considerable
progress has been achieved in case of non-coal non-atomic solid minerals. For
coal and lignite also, initiative has already been taken. For petroleum,
natural gas and atomic minerals, there is no report of progress, if any.
The impact of the changeover from
Indian to UNFC system on the national mineral inventory is expected to be
downward and very significant. This is expected to serve not only to project a
more realistic picture of India’s mineral resources, but also, in some cases,
to rouse the planners from a sense of complacency. New thrust areas of
exploration in already explored as well as virgin areas can now be planned on a
sound basis; export and other mineral related policies can now be reframed on
the basis of a more realistic knowledge base; and future exploration activities
can now be streamlined.
Table 1 Conversion table for national mineral inventory
database
Status
of estimation of resource
|
Category
of resource as per Indian system
|
UNFC
Code
|
Remark
|
A.
Freehold deposit
|
Grade
of reserve Classified
|
Proved
in-situ reserve
Probable in-situ reserve
Possible in-situ reserve
|
222
221
333
|
Equivalent
of pre-feasibility study leading to classification of economic grade
|
Grade
of reserve unclassified
|
Proved
in-situ reserve
Probable in-situ reserve
Possible in-situ reserve
|
331
332
333
|
|
Conditional
resource with grade classified
|
Proved
resource
Probable resource
Possible resource
|
331
332
333
|
|
Conditional
resource with grade unclassified
|
Proved
resource
Probable resource
Possible resource
|
331
332
334
|
|
B.
Leasehold area
|
(a)
Working mines
|
Grade
of reserve Classified
|
Proved
recoverable reserve
Probable recoverable reserve
Possible in-situ reserve
|
111
122
333
|
Mine
owner selling and earning profit
|
Grade
of whole reserve unclassified
|
Proved
recoverable reserve
Probable recoverable reserve
Possible in-situ reserve
|
111
122
333
|
Mine
owner selling and earning profit
|
Grade
of part of reserve unclassified
|
Proved
in-situ reserve
Probable in-situ reserve
Possible in-situ reserve
|
211
222
333
|
Mining
may be in one part, but economic viability of remaining part uncertain
|
(b)
Temporarily idle mines
|
Grade
of reserve Classified
|
Proved
recoverable reserve
Probable recoverable reserve
Possible in-situ reserve
|
121
122
333
|
Mine
owner already sold and earned profit
|
Grade
of whole reserve unclassified
|
Proved
recoverable reserve
Probable recoverable reserve
Possible in-situ reserve
|
121
122
333
|
-do-
|
Grade
of part of reserve unclassified
|
Proved
in-situ reserve
Probable in-situ reserve
Possible in-situ reserve
|
221
222
333
|
Mining
might have been in one part, but economic viability of remaining part
uncertain
|
(c)Mining
not commenced
|
Grade
of resource classified
|
Proved
in-situ reserve
Probable in-situ reserve
Possible in-situ reserve
|
221
222
333
|
Economic
viability not yet proven through actual sale and profit
|
(d)
Conditional resource
|
Grade
classified or unclassified
|
Proved
in-situ reserve
Probable in-situ reserve
Possible in-situ reserve
|
331
332
333
|
|
Table 2 Impact of UNFC on National Mineral Inventory as on
1-4-2000
Reserve/Resource
|
Indian System
|
UNFC System
|
|
Category
|
Quantity
|
Code
|
Quantity
|
Copper ore
|
Reserve
|
Proved, Probable & Possible
|
713 MT
|
111, 121, 122
|
290 MT
|
Resource
|
Conditional resource
|
722 MT
|
221, 222, 331, 332, 333, 334
|
1049 MT
|
Lead-Zinc ore
|
Reserve
|
Proved, Probable & Possible
|
231 MT
|
111, 121, 122
|
101 MT
|
Resource
|
Conditional resource
|
280 MT
|
221, 222, 331, 332, 333, 334
|
384 MT
|
Chromite
|
Reserve
|
Proved, Probable & Possible
|
114 MT
|
111, 121, 122
|
47 MT
|
Resource
|
Conditional resource
|
73 MT
|
221, 222, 331, 332, 333, 334
|
132 MT
|
Rock Phosphate
|
Reserve
|
Proved, Probable & Possible
|
193 BT
|
111, 121, 122
|
74 BT
|
Resource
|
Conditional resource
|
122 BT
|
221, 222, 331, 332, 333, 334
|
207 BT
|
|
MT- Million tons
|
BT- Billion tons
|
|