Sell it back to Apple, or recycle it through them. They're best placed to recycle it as they know all the components and materials. Anyone else recycling it will probably just ship it to another country to go into landfill.
1000 kg is 2204.62262[...] lbs. For them to put the exact number "2204" smells like someone told them "about 1000kg of gold" and whoever wrote that report just converted that to "2204 lbs". And since it's a rounding down, they can claim "More than 2204 lbs". Apple not knowing how significant figures work and giving out a number that was probably a guess to be an exact figure? That's why the alarm I mentioned above got triggered.
[1] https://www.huffpost.com/entry/apple-ton-of-gold-recycling_n... has a link to Apple's PDF: http://images.apple.com/environment/pdf/Apple_Environmental_... where you can search for "2204".