Articles of incorporation is the US term.

When a company is set up, the articles of incorporation are agreed in the form of a resolution. However, they then have to be notarised in order to be valid: that is, embodied in a notarial instrument. The "minuta" is essentially the instruction sent to the notary containing the text of the articles, asking him/her to draw up the necessary instrument. Here is an example; this one's from Peru (maybe your document is too):

"MINUTA
Señor Notario:
Sírvase Usted extender en su Registro de Escritura Pública una de CONSTITUCIÓN SOCIAL que otorga la asociación a denominarse................, representada por.......... (indicar nombre completo), según autorización conferida en el Acta de Constitución Social de fecha........., que se servirá insertar a la presente; cuyos términos y condiciones son las siguientes: [...]"
The articles follow.
http://www.fundacion.telefonica.com.pe/pronino/textos/minuta...

Strictly speaking, a correct translation of this, in my opinion, would be "minute copy" or just "minute", which is a version of a document submitted to a civil law notary and then worked up (engrossed) into an instrument, and subsequently filed by the notary. But this term is rarely used in practice and would probably not be properly understood by most readers. The usual term is "draft". The objection to this term could be that a draft is commonly a version of a document subject to subsequent revision, which this isn't: it is definitive in terms of what it says, but not yet a formal instrument. But it's the standard term.

See these previous questions (answer from Billh in the second one):

http://www.proz.com/kudoz/spanish_to_english/mining_minerals...
http://www.proz.com/kudoz/spanish_to_english/business_commer...

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Note added at 5 hrs (2014-10-09 10:29:54 GMT)
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Sorry; in my second alternative (the one I'm not really recommending) I inadvertently put "association" instead of "incorporation".

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Note added at 6 hrs (2014-10-09 10:52:34 GMT)
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The relevant definition of "minuta" is the first one in the DRAE. Note that they use the word "borrador":

"minuta
1. f. Extracto o borrador que se hace de un contrato u otra cosa, anotando las cláusulas o partes esenciales, para copiarlo después y extenderlo con todas las formalidades necesarias para su perfección."
http://lema.rae.es/drae/?val=minuta


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Note added at 6 hrs (2014-10-09 11:30:27 GMT)
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This comes from a Peruvian decree and refers to the documentation that companies incorporated in Peru have to present to the Peruvian Superintendencia de Banca y Seguros. Text here:
http://www.smv.gob.pe/sil/DS_0000198400559001.doc

Why do they specify the minuta and not the escritura? Because this may be done before the escritura yet exists? I don't know. But in any case, a minuta is what I have said: a "draft", but not in the sense of a provisional text; it is the definitive but unnotarised text of the acta de constitución.

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Note added at 8 hrs (2014-10-09 12:50:59 GMT)
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Another reference, which helps to meet Sandro's point: the "minuta" is a formal document in Peru:

"¿Cuáles son los pasos para constituir una empresa o crear una sucursal en el Perú? [...]
Elaboración de la Minuta.- La minuta es un documento privado, elaborado y autorizado por un abogado, que contiene el acto o contrato social, a través del cual los miembros de la sociedad manifiestan su voluntad de constituir la empresa, y en donde se señalan todos los acuerdos respectivos. Este documento se debe presentar ante un notario para su elevación a escritura pública. [...]
Para la elaboración de la minuta se necesita cumplir con los siguientes requisitos: [...]".
http://mirandalawyers.com/bloglegal/?p=827

So it's the draft articles in the sense that it's unnotarised, but it has to conform to a series of requirements and is a formal, definitive text.

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Note added at 8 hrs (2014-10-09 13:08:03 GMT)
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Maybe after all it would be better to use a term that reflects the definitive nature of the document, such as "agreed articles of incorporation" or "unnotarized (agreed) articles of incorporation".

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Note added at 8 hrs (2014-10-09 13:15:16 GMT)
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Or even perhaps something like "private contract of association". It really is a contract, in effect. It has to be signed by a lawyer.

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Note added at 8 hrs (2014-10-09 13:15:31 GMT)
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I meant "private contract of incorporation".