From FlyerGuide Wiki

Silver: For members who fly 31,250 actual miles or 50 segments on Mexicana or Star Alliance partners in a 12-month period. Benefits include:

• 25% mileage bonus on all flight segments flown on Mexicana and Star Alliance airlines.
• Complimentary upgrades for member and companion.
• Baggage I.D. tags.
• Access to Mexicana Executive Lounges.
• Priority boarding and waitlisting for Mexicana flights.
• Exclusive promotions.

Gold: For members who fly 50,000 actual miles or 80 segments on Mexicana or Star Alliance airlines in a 12-month period. Benefits include the above listed, plus:

• 50% mileage bonus on all flight segments flown on Mexicana and Star Alliance airlines.
• Preferential check-in counter in all Star Alliance airports.
• Boarding priority on Mexicana and Star Alliance flights.
• Priority reservations and waitlist priority on Mexicana and Star Alliance flights.
• Access to Star Alliance Gold Lounges.
• Priority baggage handling tags.
• Priority baggage claim on Mexicana and Star Alliance flights.
• Extra 20 kg baggage allowance.