grammar.adjectives.possessives-long
Mío, tuyo, suyo after the noun
The long forms follow the noun or ser: un amigo mío ('a friend of mine'), la culpa es tuya, ¡Dios mío!
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Explication
Spanish has a second, 'stressed' set of possessives that go after the noun or after ser, agreeing fully in gender and number: mío/a/os/as, tuyo, suyo, nuestro, vuestro, suyo. After a noun they translate 'of mine/yours/etc.': un amigo mío, una idea tuya, un cliente nuestro.
After ser they state ownership: el error fue mío, la culpa es tuya, la decisión es suya. They also appear in exclamations and forms of address: ¡Dios mío!, amor mío, muy señor mío.
Combined with a definite article, these forms become possessive pronouns and stand alone: el mío, la tuya, los nuestros — see the possessive pronouns rule. As elsewhere, suyo is ambiguous (his/her/your/their) and can be clarified with de él, de ella, etc.
Exemples
A colleague of mine lives in Asunción.
Région: global
The decision is yours/his/hers.
Région: global
A colleague of mine lives in Asunción; the office next door is his.