Nick gave the correct answer.
First, you cover the material you want to dissolve with a little excess HCl and, if the material is high gold or high iron or other slowly dissolving metal, you heat it to about 150F. If high copper, the reaction, itself, will heat it. Use a big beaker to help prevent foamovers - I usually use a beaker that will hold at least 5 times more that my estimate of the total volume of acids I will use. Then, you add the nitric in increments, waiting for each increment to quit reacting before adding more, and then stop adding nitric when you get no reaction with an addition, you won't ever use excess nitric and will, therefore, never have to de-NOx the solution before dropping the gold. During the last 30 years, I have never used urea (hate it) and the only time I used sulfamic acid was in a special solution that was 50% nitric. I have also never evaporated the solution, as in Hoke - well, maybe once or twice, when I had partied the night before and really overadded the nitric.
The nitric increment method above becomes second nature after doing it a few times. More details are on the forum. About 10 years ago, when I first introduced this nitric method to the forum (over and over until it took), it took people (except lazersteve) about a year before they tried it. Now, only the newbies that have been watching lousy Youtube videos premix their AR. The nitric in increments method is now standard forum practice. It would behoove anyone to master this method. I forgot to mention that, by using the nitric in increments, you also have more control over foamovers and the rate at which the red-brown NO2 fumes are produced. Also, for each 30g of gold or base metals, it will take about 125ml of HCl or muriatic acid and 25ml of nitric. This is only ballpark. I usually start with 150ml of HCl per 30g because excess HCl doesn't cause any problems. Also, if you use up all the HCl, it will stop dissolving gold no matter how much nitric you add. Extra HCl is a safety net. This whole discussion assumes your HCl is at least 30% by weight and the nitric is, at least 67% by weight. Muriatic acid is usually about 30.45% HCl, by weight.
I also have found that tap water dilution of the AR solution tends to reduce or eliminate the adverse effects of too much nitric. I automatically add 3 times water to my AR solutions before filtering the solution, as preparation for dropping the gold. This 3 to 1 dilution also drops out essentially all of the silver as chloride. This allows the silver to be filtered out and then enables all the gold to drop out, usually with no extra SMB (I use sodium sulfite) needed. This dilution also makes it easy to produce a crystal-clear filtered solution. This creates a little more waste but, to me, since it makes everything go much smoother, it is worth it.