XML 124 R110.htm IDEA: XBRL DOCUMENT
v3.19.1

Identification and business activity (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Compania Minera Condesa S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Compania Minera Colquirrumi S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Sociedad Minera El Brocal S.A.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary | [1] | Peru |
Inversiones Colquijirca S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary | [1],[2] | Peru |
S.M.R.L. Chaupiloma Dos de Cajamarca [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Minera La Zanja S.R.L. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Minera Julcani S.A. de C.V. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Mexico |
Compania de Minas Buenaventura Chile Ltda. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Chile |
El Molle Verde S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Apu Coropuna S.R.L. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Cerro Hablador S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Minera Azola S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Compania Minera Nueva Italia S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Consorcio Energetico de Huancavelica S.A. [Member] | Energy generation and transmission services [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Empresa de Generacion Huanza S.A. [Member] | Energy generation and transmission services [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary | [2] | Peru |
Contacto Corredores de Seguros S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Contacto Risk Consulting S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Buenaventura Ingenieros S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary | [3] | Peru |
BISA Argentina S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary | [4] | Argentina |
Procesadora Industrial Rio Seco S.A. [Member] | Industrial activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Country of incorporation of subsidiary |  | Peru |
Direct [Member] | Compania Minera Condesa S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% | 100.00%
Direct [Member] | Compania Minera Colquirrumi S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% | 100.00%
Direct [Member] | Sociedad Minera El Brocal S.A.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [1] | 3.19% | 3.19%
Direct [Member] | Inversiones Colquijirca S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [1],[2] | 89.76% | 89.76%
Direct [Member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 20.00% | 20.00%
Direct [Member] | Minera La Zanja S.R.L. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 53.06% | 53.06%
Direct [Member] | Minera Julcani S.A. de C.V. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 99.80% | 99.80%
Direct [Member] | Compania de Minas Buenaventura Chile Ltda. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 90.00% | 90.00%
Direct [Member] | El Molle Verde S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 99.98% | 99.98%
Direct [Member] | Apu Coropuna S.R.L. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 70.00% | 70.00%
Direct [Member] | Cerro Hablador S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 99.00% | 99.00%
Direct [Member] | Minera Azola S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 99.00% | 99.00%
Direct [Member] | Compania Minera Nueva Italia S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Direct [Member] | Consorcio Energetico de Huancavelica S.A. [Member] | Energy generation and transmission services [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% | 100.00%
Direct [Member] | Empresa de Generacion Huanza S.A. [Member] | Energy generation and transmission services [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [2] | 0.00% | 0.00%
Direct [Member] | Contacto Corredores de Seguros S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 99.98% | 99.98%
Direct [Member] | Contacto Risk Consulting S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Direct [Member] | Buenaventura Ingenieros S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [3] | 0.00% | 100.00%
Direct [Member] | BISA Argentina S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [4] | 0.00% | 56.42%
Direct [Member] | Procesadora Industrial Rio Seco S.A. [Member] | Industrial activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% | 100.00%
Indirect [Member] | Compania Minera Condesa S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Indirect [Member] | Compania Minera Colquirrumi S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Indirect [Member] | Sociedad Minera El Brocal S.A.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [1] | 58.24% | 58.24%
Indirect [Member] | Inversiones Colquijirca S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [1],[2] | 10.24% | 10.24%
Indirect [Member] | S.M.R.L. Chaupiloma Dos de Cajamarca [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 40.00% | 40.00%
Indirect [Member] | Minera La Zanja S.R.L. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Indirect [Member] | Minera Julcani S.A. de C.V. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.20% | 0.20%
Indirect [Member] | Compania de Minas Buenaventura Chile Ltda. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 10.00% | 10.00%
Indirect [Member] | El Molle Verde S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.02% | 0.02%
Indirect [Member] | Apu Coropuna S.R.L. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Indirect [Member] | Cerro Hablador S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 1.00% | 1.00%
Indirect [Member] | Minera Azola S.A.C. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 1.00% | 1.00%
Indirect [Member] | Compania Minera Nueva Italia S.A. [Member] | Mining activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 94.27% | 93.36%
Indirect [Member] | Consorcio Energetico de Huancavelica S.A. [Member] | Energy generation and transmission services [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
Indirect [Member] | Empresa de Generacion Huanza S.A. [Member] | Energy generation and transmission services [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [2] | 100.00% | 100.00%
Indirect [Member] | Contacto Corredores de Seguros S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.02% | 0.02%
Indirect [Member] | Contacto Risk Consulting S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 98.00% | 98.00%
Indirect [Member] | Buenaventura Ingenieros S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [3] | 0.00% | 0.00%
Indirect [Member] | BISA Argentina S.A. [Member] | Construction, engineering services and insurance brokerage [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary | [4] | 0.00% | 43.58%
Indirect [Member] | Procesadora Industrial Rio Seco S.A. [Member] | Industrial activities [Member] |  |  |
Disclosure of identification and business activity [Line Items] |  |  |
Proportion of ownership interest in subsidiary |  | 0.00% | 0.00%
[1] | As of December 31, 2018 and 2017, the participation of the Company in the voting rights of El Brocal is 61.43 percent. Inversiones Colquijirca S.A. (hereafter “Colquijirca”), a Group’s subsidiary (99.99 percent as of December 31, 2018 and 2017), has an interest in El Brocal’s capital stock, through which the Company holds an indirect participation in El Brocal of 58.24 as of December 31, 2018 and 2017.
[2] | As of December 31, 2018 and 2017, the Group's financial statements include consolidated assets and liabilities corresponding to the trust assets held as part of the financial leasing and lease back agreements maintained by El Brocal (which operates the Colquijirca mining unit) and Empresa de Generación Huanza S.A., with the Banco de Credito del Peru, see notes 16(a) and 11(c).
[3] | As of April 30, 2018, the Company sold its investment in Buenaventura Ingenieros S.A. for US$7.1 million with a related sale costs of US$11.2 million. The transaction generates a net loss of US$4.1 million. See note 26.
[4] | As of August 06, 2018, the liquidation of this subsidiary was made.

X
- References No definition available. + Details
Name: | cik0001013131_DisclosureOfIdentificationAndBusinessActivityLineItems
Namespace Prefix: | cik0001013131_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The country in which a subsidiary of the entity is incorporated. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_ii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_ii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 12 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_12_b&doctype=Standard -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19B -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_b&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_CountryOfIncorporationOrResidenceOfSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2018-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2018-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph 19B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_19B_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInSubsidiary
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_CompaniaMineraCondesaSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cik0001013131_MiningActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_CompaniaMineraColquirrumiSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_SociedadMineraElBrocalSaaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_InversionesColquijircaSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_SmrlChaupilomaDosDeCajamarcaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_MineraLaZanjaSrlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_MineraJulcaniSaDeCvMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_CompaniaDeMinasBuenaventuraChileLtdaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_ElMolleVerdeSacMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_ApuCoropunaSrlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_CerroHabladorSacMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_MineraAzolaSacMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_CompaniaMineraNuevaItaliaSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_ConsorcioEnergeticoDeHuancavelicaSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cik0001013131_EnergyGenerationAndTransmissionServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_EmpresaDeGeneracionHuanzaSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_ContactoCorredoresDeSegurosSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cik0001013131_ConstructionEngineeringServicesAndInsuranceBrokerageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_ContactoRiskConsultingSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_BuenaventuraIngenierosSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_BisaArgentinaSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=cik0001013131_ProcesadoraIndustrialRioSecoSaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=cik0001013131_IndustrialActivitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_OwnershipInterestInSubsidiaryAxis=cik0001013131_DirectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | cik0001013131_OwnershipInterestInSubsidiaryAxis=cik0001013131_IndirectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |