Arrange quality inspection sampling for mining

1. I've used several graphics cards, but I haven't seen any mine cards. On a whim, I started with Xianyu 359 and got a sapphire rx474 platinum card. On December 13, 18, Xianyu placed an order and got it on December 16. Before that, I sent an open box sticker. It's almost a month, and the graphics card works normally< There are several misunderstandings in the mine card. Let's talk about them to the fags:
1. The chrysanthemum yellow mine card is a pure misinformation. Unless it's slag, it's hard to judge by its appearance. The MOS of mine card power supply is black and oily. It should take a long time to dig. See the picture for chrysanthemum. Do you want to see if it's yellow
2. Calculate the mining time according to the ex factory date - this is to be discussed: powerful large mines can indeed buy new cards in batches, but small and medium-sized mines also have a group of indivials who follow suit. At the beginning, they were out of stock, and a large number of salted fish swept and received cards, which led to 18 years of card panic. These personal cards collapsed before they were collected for a long time, and they still have a lot of remaining life;

2. First, it depends on the specific gravity. The heavier the weight of the same volume of gold ore, the higher the metal content; Second, to see the luster, must be that kind of golden yellow, gold content will be higher, light yellow particles larger, generally more pyrite. Third, it depends on the appearance of the ore.