Persons employed at deposits of ores and minerals by economic activity


Time series: Ecology_13.5_en.xls
Underground reserves
Contact
Contact organisation

National Statistical Institute

Contact organisation unit

‘Environmental and Energy Accounts’ Department

Contact name

Ivaylo Rangelov

Contact person function

State expert

Contact mail address

2 P. Volov street, 1038 Sofia

Contact email address

irangelov@nsi.bg

Contact phone number

+359 2 9857 113

Contact fax number
Metadata update
Metadata last certified20 December 2018
Metadata last posted20 December 2018
Metadata last update20 December 2018
Statistical presentation
Data description

Statistical information on depletion of the ores, minerals and fossil fuels which represent a limited, non-renewable resource.

In the context of the European economic environmental accounts it aims to collect primary data necessary to compile accounts on non-refundable underground assets of minerals and ores in natural and value terms.

Reserves of natural resources are calculated and evaluated as the bowels, without taking into account losses during extraction and processing (enrichment).

Classification system

- ‘Classification of reserves and resources of solid underground resources’ drawn up in accordance with the Act on the Underground Resources.

- NACE.BG 2008 /2 digits/.

Sector coverage

Exhaustive survey covering all economic entities - holders of concessions for extraction, and companies that have reported receipts from extraction activity for the previous reference year.

Statistical concepts and definitions

Reserves and resources of underground natural resources - are minerals and ores deposits in the ground or on the ground with a specific geological knowledge about them and economic interest. The following classifying categories exist:

Reserves – That part of the underground resources, which are expected to be extracted commercially with some degree of certainty.

Proven reserves - Such reserves about which is found they can be technically and economically producible with a high level of certainty (90% or more) given the current technology and relative prices.

Probable reserves - reserves are not proven yet, but regarding which is estimated to have more than 50 % chance of being technically and economically producible. 

Resources - possible reserves, which are at present not regarded as probable but are estimated to have a significant, but less than 50 % chance of being exploitable.

Statistical unit

Economic entity

Statistical population

Еconomic entities - holders of concessions for extraction, and companies that have reported receipts from extraction activity for the previous reference year.

Reference area

Total for the country

Time coverage

2012-2017

Base period

Not applicable.

Unit of measure

Thousand tons; thousand m3; number; thousand decares; year.

Reference period

Year

Institutional mandate
Legal acts and other agreements

Law on Statistics;

- Regulation (EU) No.691/2011 of EP and the Council of 6 July 2011 on European environmental economic accounts

Data sharing

Not applicable.

Confidentiality
Confidentiality - policy

Law on Statistics in force.

According Art. 25 of the Law on Statistics individual data are not published. Dissemination of individual data is possible only in compliance with Art. 26 of the Law on Statistics.

Confidentiality - data treatment

According Art. 25 of the Law on Statistics individual data are not published. Dissemination of individual data is possible only in compliance with Art. 26 of the Law on Statistics.

Release policy
Release calendar

The date of release of statistical information is indicated in the Release Calendar presenting the results of the statistical surveys carried out by the National Statistical Institute.

Release calendar access

The calendar is available on the NSI website: http://www.nsi.bg/en/node/480

User access

Data on underground reserves is published on the NSI website, item ‘Environment, dub-item 'Underground reserves' in accordance with the Law on Statistics and the European Statistics Code of Practice respecting the professional independence and aimed at objectivity, transparency and equal treatment of all consumers.

Frequency of dissemination

Annual

Accessibility and clarity
News release

Not applicable.

Publications

Electronic publication ‘Environment’

On-line database

Detailed data on underground reserves are available to all users of the NSI website under the heading Environment: http://www.nsi.bg/en/node/14683/

Micro-data access

Not applicable.

Other

Information service upon request, according to the Rules for the dissemination of statistical products and services in NSI.

Documentation on methodology

Electronic statistical questionnaire

Quality documentation

- European Statistics Code of Practice;

- A common framework for quality management in the National Statistical System.

Quality management
Quality assurance

- European Statistics Code of Practice;

- A common framework for quality management in the National Statistical System.

Quality assessment

No information. Data quality report is not prepared.

Relevance
User needs

No information. Survey about satisfaction of customers is not conducted.

User satisfaction

Survey about satisfaction of customers is not conducted.

Completeness

Exhaustive survey.

Accuracy and reliability
Overall accuracy

The survey is comprehensive and there are no sampling errors.

Sampling error

The survey is comprehensive and there are no sampling errors.

Non-sampling error

Not applicable.

Timeliness and punctuality
Timeliness
Punctuality
Coherence and comparability
Comparability - geographical

Not applicable.

Comparability - over time

By years.

Coherence - cross domain
Coherence - internal
Cost and burden

Survey about respondents' burden is not conducted.

Data revision
Data revision - policy

Revision of the data is applied if necessary.

Data revision - practice

Revision of the data is applied if necessary.

Statistical processing
Source data

Off-line electronic questionnaire filled-in by economic entities - holders of concessions for extraction, and companies that have reported receipts from extraction activity for the previous reference year.

Frequency of data collection

Annually.

Data collection

Exhaustive survey covering economic entities - holders of concessions for extraction, and companies that have reported receipts from extraction activity for the previous reference year.

Data validation

Comparing the data with those reported in the previous year - regarding mistakenly reported data, measure units, number of digits and others.

The data validation goes through three stages:

•At the data entry from the respondents the questionnaire has logical and arithmetic controls;

•At regional level by the NSI Regional Statistical Offices;

•At national level by the NSI Head Office. Comparing the data with those reported in the previous year - regarding mistakenly reported data, measure units, number of digits and others.

Data compilation

Dataset containing all the units on the territory of the country.

Adjustment

Not applicable.

Comment
Download in SDMX 2.1 file format: Underground reserves
Metadata Structure Definition in SDMX 2.1: ESMS_MSD+BNSI+2.0+SDMX.2.1.xml
Download in SDMX 2.0 file format: Underground reserves
Metadata Structure Definition in SDMX 2.0: ESMS_MSD+BNSI+2.0+SDMX.2.0.xml
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