Yes, exactly. It would have all of the minerals that are in the bones. It is both calcium and phosphorus and more.
The recipe is 1 part mineral rich material to 10 parts apple cider vinegar. You can technically use other vinegars or even an equivalent citric acid solution, but I like using apple cider vinegar for my fruit trees as it has other benefits and isn’t made from anything GMO. I wrote an article about calcium vinegar extractions
here, and the same process is used for any type of material, be it bone, shells, or plants. You do want the material broken into pieces, I don’t find powder ideal because it is hard to strain, but it does work. The larger the pieces the longer it takes to extract. Usually, it takes about 5-7 days and then you can strain it out and use the vinegar when you water or in foliar sprays.
The material is spent when it floats; the vinegar has extracted everything it can hold after it stops bubbling. When you give it a little swirl, check for bubbles coming off the material which tells you if the vinegar is still working on it. So if you don’t have floating material after the vinegar is done, you may be able to use it for subsequent extractions if desired.
This is from Nigel Palmer’s website, he’s done analyses of various homemade amendments. This shows what can be in a bone extraction as well as others, you may need to click on it to enlarge it:
View attachment 19818