The sums involved are usually in the millions of dollars, and the investor is promised a large share, often forty percent. The proposed deal is often presented as a "harmless" white-collar crime, in order to dissuade participants from later contacting the authorities. Similarly, the money is often said to be the embezzled funds of a recently deposed or killed dictator. The operation is professionally organized in Nigeria, with offices, working fax numbers, and often contacts at government offices. The investor who attempts to research the background of the offer will usually find that all pieces fit perfectly together.

If they then agree to the deal, the other side will first send several documents bearing official government stamps, seals etc., and then introduce delays, such as "in order to transmit the money, we need to bribe a bank official. Could you help us with a loan?" or "In order for you to be allowed to be a party to the transaction, you need to have holdings at a Nigerian bank of $100,000 or more" or similar. More delays and more additional costs are added, always keeping the promise of an imminent large transfer alive. Sometimes psychological pressure is added by claiming that the Nigerian side, in order to pay certain fees, had to sell all belongings and borrow money on their house.

In any case, the promised money transfer never happens. The money or gold does not exist.

Such spam is often sent from Internet cafes equipped with satellite Internet. Recipient addresses and email content are copied and pasted into a webmail interface using a standalone storage medium, such as a memory card. Some London-based gangs have been known to use spamware on laptops which they surreptitiously connect to the cafe's network, but even this software is notably out-of-date. While this method is significantly more labour-intensive per mail sent than others, it offers near-total anonymity and allows them to very quickly and easily relocate. The often very professional layout of web pages and so on used in the scams suggests that they do not lack technical sophistication.