To catch any Gordo you need a Gordo Snare.
The first step to gather Gold Slimes this way is to first get a Gold Gordo. I'll answer any questions you'll have on the guide and anything else about the game, though I would prefer you kept them about the guide :D This is my first guide, so every single piece of feedback will be highly appreciated, from the formatting to the content itself :)
There's a TL DR section at the end that you might prefer if you already know the mechanics I describe here. Unfortunately, I don't think that there is much you can do with the Gold Slimes once you get them, since they'll run away from the stage as soon as you feed them. Even though the guide you're reading allows you to obtain several Gold Slimes at once at a slightly more consistent rate, z0mbiesrock's technique can be used a lot earlier in the game, allowing you to benefit from the sweet Gold Plort selling prices a lot sooner, so use whichever you see fit for your current in-game situation. There is also a great guide made by z0mbiesrock that you can use to do the same. This is a Slime Rancher end-game guide that shows how you can keep Gold Slimes in your ranch. If you're sensitive to these kinds of spoilers I advise you to first explore the last zones of the game *** *** SPOILERS: This guide refers to several end-game items and areas.