Dear Colleague,
Definition of Appropriate Government
The definition of "Appropriate Government" is a good term to analyze. As far as any scheduled establishment or the nature of the industry is covered, "Central" as the Appropriate Government means the appropriate government is Central only. Minimum wages as stipulated by the Central Government will be appropriate in your case of the oil sector. Moreover, the licenses for contractors and RC to the Principal Employer are obtained from Central Labour Authorities only.
Hence, from the perspective of Minimum Wages, Contract Labour Act, and Industrial Dispute Act, it is right to follow the Central Government's fixed minimum wages for the respective scheduled employment. Within that notification, you may follow different wages for different skill categories depending on the classification given in the notifications based on skill levels as stipulated in the notifications.
Definitions under Various Acts
A) The definition of Appropriate Government under the Minimum Wages Act 1948 is as follows:
2(b) "appropriate Government" means, (i) in relation to any scheduled employment carried on by or under the authority of the [Central Government or a railway administration], or in relation to a mine, oilfield, or major port, or any corporation established by [a Central Act], the Central Government, and (ii) in relation to any other scheduled employment, the State Government.
B) The definition of Appropriate Government under the Contract Labour Act is as follows:
2. Definitions.-(1) In this Act, unless the context otherwise requires,-(a) 'appropriate Government' means,-(i) in relation to an establishment in respect of which the appropriate Government under the Industrial Disputes Act, 1947 (14 of 1947), is the Central Government; (ii) in relation to any other establishment, the Government of the State in which that other establishment is situated.
C) The definition of Appropriate Government under the Industrial Disputes Act 1947 is as follows:
2. Definitions.- In this Act, unless there is anything repugnant in the subject or context,--(a) "appropriate Government" means-- (i) in relation to any industrial dispute concerning any industry carried on by or under the authority of the Central Government, ................ or the Oil and Natural Gas Commission established under section 3 of the Oil and Natural Gas Commission Act, 1959 (43 of 1959),...................................., the Central Government, and (ii) in relation to any other industrial dispute, the State Government.
Your understanding is very correct that your appropriate Government is Central, and you need to follow Central Government Notified Minimum Wages. In some notifications released by the Central Government, they mention that the minimum wages notified by the central or state, whichever is more, have to be followed. Here, you need to be a little careful and get clarity from the Labour Commissioner and then proceed, as it comes as a GO and has administrative powers to enforce but can be legally challenged. On this point, just have a discussion with your known Labour Commissioner and then proceed.