Underground reserves

National Statistical Institute

‘Environmental and Energy Accounts’ Department

Petar Petrov

State expert

2 P. Volov street, 1038 Sofia

[email protected]

+359 2 9857 499

Not available

The data on underground reserves present information on:

-          Proved, probable reserves and resources by type - total for the country;

-          Area of underground reserves by economic activity;

-          Extraction of underground resources in physical terms;

-          Estimate of the period of depletion of reserves by type of reserve;

       -          Employed in the deposits for extraction of underground reserves by economic activity

-          Classification of industrial production - PRODCOM

-          Classification of economic activities (NACE-2008)

-          Nomenclature of underground resources;

-         The statistical survey covers enterprises that have been granted concessions for the extraction of underground resources and those that have reported revenues from the extractive industry for the previous reporting yearNomenclature of products of the extractive industry.

The statistical survey covers enterprises that have been granted concessions for the extraction of underground resources and those that have reported revenues from the extractive industry for the previous reporting year

RDeposit of underground resources" is a natural or technogenic accumulation of mineral and organic substances (minerals) or the existence of a deep geothermal resource, which under certain technical, environmental and financial and economic conditions can be the subject of extraction;

"Underground resources" are natural solid, liquid and gaseous mineral and organic formations and geothermal resources in the earth's subsoil and mining waste from their exploration, extraction and primary processing, which may be used in material production;

"Reserves" are certain quantities or volumes of minerals in the deposit of underground resources, which are technically possible, environmentally friendly and economically profitable to be the subject of extraction;

"Extraction" is the overall technological process of extracting solid, liquid, gaseous minerals and geothermal resources from the earth's subsoil, including by transforming their natural state;

"Resources" are the probable quantities or volumes of minerals in the deposit that have not been delineated and proven sufficiently convincingly by the geological exploration work carried out or for which there is a lack of sufficient technical, technological, environmental and economic assessment necessary for the design and implementation of mining

The statistical unit is an enterprise

The statistical population consists of active statistical units (enterprises) that have been granted concessions for the extraction of subsoil resources and those that reported revenues from the extractive industry for the previous reporting year

Total for the country.

2019-2023

Not applicable.

-              Statistical survey "Underground reserves".

Information from other statistical surveys (business statistics) is also used to define the general population, verify data and make estimates.

Annually.

From the respondents, according to their activity, data is collected on:

-              Deposits exploited by the enterprise (area and employees );

-              Underground reserves by deposits and raw materials (proven reserves, probable reserves, resources);

-              Availability and movement of underground reserves by deposits;

-              Revenues, expenses and fixed assets related to production.

Data validation is part of the activities to ensure the quality of statistical information. Primary data are validated in terms of completeness, correct classification, units of measurement, comparability with previous years, comparability with data from other statistical areas and/or administrative sources, logical control, etc. Statistical data are validated in terms of their comparability, accuracy, reliability, etc., in accordance with the quality criteria according to the Statistics Act.

Data processing is carried out by strictly applying the survey methodology and data verification methods.

Data processing includes the actions by which, based on the primary data, brought into an appropriate form, statistical data are calculated, using specialized software products for this purpose.

Not applicable.

TThe quality of the data is ensured by applying the principles of the European Statistics Code of Practice and the Common Framework for Quality Management in the National Statistical System, including through the application of the internal methodology "Statistics and Environmental Accounts, developed by the NSI.

The quality assurance activities guarantee compliance with the requirements of the Statistics Act in terms of quality criteria: adequacy, accuracy, timeliness, punctuality, accessibility and clarity, comparability and logical coherence. They also ensure the application of the principles of the European Statistics Code of Practice: sound methodology; appropriate statistical procedures; moderate burden on respondents; cost-effectiveness; applicability; accuracy; timeliness and accuracy of presentation; comparability and coherence; accessibility and clarity.

The quality assessment is carried out at each stage of the statistical production process, in accordance with the Common Framework for Quality Management in the NSS and the principles of the European Statistics Code of Practice. It includes statistical processes and statistical information. The requirements of the current methodological documents are applied for quality assessment, including the instructions in the internal methodology "Statistics and Environmental Accounts", developed by the NSI.

To ensure high quality of the data, their consistency with the data on industrial production (Nomenclature of Industrial Production - PRODCOM) is checked.

In order to ensure the quality of the data, work is also being done to continuously improve the online-based information system for collecting primary data, providing the possibility of arithmetic and logical control of the input data, and additional analyses and checks are being carried out.

Data on underground reserves are essential for the study of economic indicators related to their exploitation and their impact and interaction with the environment.

The main users of statistical information from the study are state and municipal structures, scientific institutes, associations, companies and citizens.

The NSI conducts a regular statistical survey "User satisfaction with the statistical information products and services provided", which covers all statistical areas. It aims to assess user satisfaction with the statistical information provided by the NSI and to define recommendations for the future development of the statistical system in accordance with user needs.

The data complies with the requirements of the applicable legislation in terms of coverage and observable indicators.

All statistics data are available

Data accuracy, as one of the criteria for the quality of statistical information, according to the Statistics Act, is guaranteed through quality assurance activities within the statistical production process.

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In accordance with the principles of the European Statistics Code of Practice and the requirements of the internal rules/integrated management system, statistical processes are regularly monitored and revised as necessary. Revisions are carried out according to standard, established and transparent procedures and are regularly analysed with the aim of improving data sources, statistical processes and products.

The data is revised upon change in regulatory requirements, the applied methodology, or when necessary.

Not applicable (no preliminary data published).

The data are published 14 months after the reporting year.

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The data are published according to the deadlines in the Calendar for the dissemination of the results of the statistical surveys of the NSI.

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Data is compiled at the national level.

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The data are comparable over time. Time series are available from 2019 (from 2012 in INFOSTAT).

When the methodology changes, the data in the time series is revised.

2019 - 2023

The data are reconciled with:

 Data from business statistics (industrial production).

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The data have a high degree of internal consistency. The quality assessment procedure checks the consistency of the primary and statistical data in terms of weight, area, metal content for metal ores and economic activities, of the aggregated and detailed data.

Regular press release on the NSI website

-          Statistical Yearbook

-          Statistical Reference Book

-          Electronic Publication "Environment"

-          Brochure "Bulgaria"

Data on underground reserves are available on the NSI website in:

- Section "Environment"

- Infostat system.

Not available.

Individual anonymized data may be provided for scientific and research purposes, in accordance with the Rules for Provision of Anonymised Individual Data for Scientific and Research Purposes of the NSI

Information service on request, according to the Rules for Dissemination of Statistical Products and Services of the NSI.

Not available.

-          Environmental statistics and accounts in Europe;

       -          Internal methodology "Environmental Statistics and Accounts"

Not available.

-          European Statistics Code of Practice

-          Integrated management system in the NSI

-          General model of the statistical production process in the NSI

-          Handbook on Internal Quality Audit in the NSI

-          Internal methodology "Environmental Statistics and Accounts"

Quality report  is published annually with the publication of statistical data

The costs (budget) for statistical surveys are disclosed in the National Statistical Program, published on the NSI website.

Reducing the burden on respondents is a priority in conducting statistical surveys. In this regard, actions are being taken to alleviate the burden, for example: collecting and checking primary data through the online-based information system "Environmental Statistics", containing strict arithmetic and logical controls; improving the instructions for filling in survey forms; providing methodological and technical assistance; continuously exploring the possibilities for using information from administrative and other sources; conducting annual training for respondents and NSI experts, etc.

The time needed to fill in the statistical forms is used as the main measure of the burden on respondents. For this purpose, a section is included in each form that respondents must fill in, regarding the time needed to fill in the form (including the time for data preparation). Based on this information and given the specifics of the study, the workload of the respondents can be determined as relatively high. The overall workload of the responsible experts is determined as high, especially in cases of revisions of data from previous reporting periods

Regulation (EC) No 223/2009 on European statistics provides for the need to establish common principles and guidelines ensuring the confidentiality of data used for the production of European statistics and access to such confidential data, with due regard to technical developments and the requirements of users in a democratic society.

The Statistics Act (Art. 25, para. 1) stipulates that individual data received and collected in statistical surveys are statistical secrets and may be used only for statistical purposes.

According to Art. 25 of the Statistics Act, individual data shall not be disclosed or provided. The provision of individual data is possible only according to Art. 26 of the Statistics Act